diff --git a/changelog/unreleased/issue-5453 b/changelog/unreleased/issue-5453
new file mode 100644
index 000000000..12c09e0b0
--- /dev/null
+++ b/changelog/unreleased/issue-5453
@@ -0,0 +1,10 @@
+Enhancement: `copy` copies snapshots in batches
+
+The `copy` command used to copy snapshots individually, even if this resulted in creating pack files
+smaller than the target pack size. In particular, this resulted in many small files
+when copying small incremental snapshots.
+
+Now, `copy` copies multiple snapshots at once to avoid creating small files.
+
+https://github.com/restic/restic/issues/5175
+https://github.com/restic/restic/pull/5464
diff --git a/cmd/restic/cmd_copy.go b/cmd/restic/cmd_copy.go
index 498d6f75d..bf86de8a7 100644
--- a/cmd/restic/cmd_copy.go
+++ b/cmd/restic/cmd_copy.go
@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"time"
 
 	"github.com/restic/restic/internal/data"
 	"github.com/restic/restic/internal/debug"
@@ -70,6 +71,39 @@ func (opts *CopyOptions) AddFlags(f *pflag.FlagSet) {
 	initMultiSnapshotFilter(f, &opts.SnapshotFilter, true)
 }
 
+// collectAllSnapshots: select all snapshot trees to be copied
+func collectAllSnapshots(ctx context.Context, opts CopyOptions,
+	srcSnapshotLister restic.Lister, srcRepo restic.Repository,
+	dstSnapshotByOriginal map[restic.ID][]*data.Snapshot, args []string, printer progress.Printer,
+) (selectedSnapshots []*data.Snapshot) {
+
+	selectedSnapshots = make([]*data.Snapshot, 0, 10)
+	for sn := range FindFilteredSnapshots(ctx, srcSnapshotLister, srcRepo, &opts.SnapshotFilter, args, printer) {
+		// check whether the destination has a snapshot with the same persistent ID which has similar snapshot fields
+		srcOriginal := *sn.ID()
+		if sn.Original != nil {
+			srcOriginal = *sn.Original
+		}
+		if originalSns, ok := dstSnapshotByOriginal[srcOriginal]; ok {
+			isCopy := false
+			for _, originalSn := range originalSns {
+				if similarSnapshots(originalSn, sn) {
+					printer.V("\n%v", sn)
+					printer.V("skipping source snapshot %s, was already copied to snapshot %s", sn.ID().Str(), originalSn.ID().Str())
+					isCopy = true
+					break
+				}
+			}
+			if isCopy {
+				continue
+			}
+		}
+		selectedSnapshots = append(selectedSnapshots, sn)
+	}
+
+	return selectedSnapshots
+}
+
 func runCopy(ctx context.Context, opts CopyOptions, gopts global.Options, args []string, term ui.Terminal) error {
 	printer := ui.NewProgressPrinter(false, gopts.Verbosity, term)
 	secondaryGopts, isFromRepo, err := opts.SecondaryRepoOptions.FillGlobalOpts(ctx, gopts, "destination")
@@ -124,49 +158,12 @@ func runCopy(ctx context.Context, opts CopyOptions, gopts global.Options, args [
 		return ctx.Err()
 	}
 
-	// remember already processed trees across all snapshots
-	visitedTrees := restic.NewIDSet()
+	selectedSnapshots := collectAllSnapshots(ctx, opts, srcSnapshotLister, srcRepo, dstSnapshotByOriginal, args, printer)
 
-	for sn := range FindFilteredSnapshots(ctx, srcSnapshotLister, srcRepo, &opts.SnapshotFilter, args, printer) {
-		// check whether the destination has a snapshot with the same persistent ID which has similar snapshot fields
-		srcOriginal := *sn.ID()
-		if sn.Original != nil {
-			srcOriginal = *sn.Original
-		}
-
-		if originalSns, ok := dstSnapshotByOriginal[srcOriginal]; ok {
-			isCopy := false
-			for _, originalSn := range originalSns {
-				if similarSnapshots(originalSn, sn) {
-					printer.V("\n%v", sn)
-					printer.V("skipping source snapshot %s, was already copied to snapshot %s", sn.ID().Str(), originalSn.ID().Str())
-					isCopy = true
-					break
-				}
-			}
-			if isCopy {
-				continue
-			}
-		}
-		printer.P("\n%v", sn)
-		printer.P("  copy started, this may take a while...")
-		if err := copyTree(ctx, srcRepo, dstRepo, visitedTrees, *sn.Tree, printer); err != nil {
-			return err
-		}
-		debug.Log("tree copied")
-
-		// save snapshot
-		sn.Parent = nil // Parent does not have relevance in the new repo.
-		// Use Original as a persistent snapshot ID
-		if sn.Original == nil {
-			sn.Original = sn.ID()
-		}
-		newID, err := data.SaveSnapshot(ctx, dstRepo, sn)
-		if err != nil {
-			return err
-		}
-		printer.P("snapshot %s saved", newID.Str())
+	if err := copyTreeBatched(ctx, srcRepo, dstRepo, selectedSnapshots, printer); err != nil {
+		return err
 	}
+
 	return ctx.Err()
 }
 
@@ -189,8 +186,63 @@ func similarSnapshots(sna *data.Snapshot, snb *data.Snapshot) bool {
 	return true
 }
 
+// copyTreeBatched copies multiple snapshots in one go. Snapshots are written after
+// data equivalent to at least 10 packfiles was written.
+func copyTreeBatched(ctx context.Context, srcRepo restic.Repository, dstRepo restic.Repository,
+	selectedSnapshots []*data.Snapshot, printer progress.Printer) error {
+
+	// remember already processed trees across all snapshots
+	visitedTrees := restic.NewIDSet()
+
+	targetSize := uint64(dstRepo.PackSize()) * 100
+	minDuration := 1 * time.Minute
+
+	for len(selectedSnapshots) > 0 {
+		var batch []*data.Snapshot
+		batchSize := uint64(0)
+		startTime := time.Now()
+
+		// call WithBlobUploader() once and then loop over all selectedSnapshots
+		err := dstRepo.WithBlobUploader(ctx, func(ctx context.Context, uploader restic.BlobSaver) error {
+			for len(selectedSnapshots) > 0 && (batchSize < targetSize || time.Since(startTime) < minDuration) {
+				sn := selectedSnapshots[0]
+				selectedSnapshots = selectedSnapshots[1:]
+				batch = append(batch, sn)
+
+				printer.P("\n%v", sn)
+				printer.P("  copy started, this may take a while...")
+				sizeBlobs, err := copyTree(ctx, srcRepo, dstRepo, visitedTrees, *sn.Tree, printer, uploader)
+				if err != nil {
+					return err
+				}
+				debug.Log("tree copied")
+				batchSize += sizeBlobs
+			}
+
+			return nil
+		})
+		if err != nil {
+			return err
+		}
+
+		// add a newline to separate saved snapshot messages from the other messages
+		if len(batch) > 1 {
+			printer.P("")
+		}
+		// save all the snapshots
+		for _, sn := range batch {
+			err := copySaveSnapshot(ctx, sn, dstRepo, printer)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
 func copyTree(ctx context.Context, srcRepo restic.Repository, dstRepo restic.Repository,
-	visitedTrees restic.IDSet, rootTreeID restic.ID, printer progress.Printer) error {
+	visitedTrees restic.IDSet, rootTreeID restic.ID, printer progress.Printer, uploader restic.BlobSaver) (uint64, error) {
 
 	wg, wgCtx := errgroup.WithContext(ctx)
 
@@ -204,10 +256,12 @@ func copyTree(ctx context.Context, srcRepo restic.Repository, dstRepo restic.Rep
 	packList := restic.NewIDSet()
 
 	enqueue := func(h restic.BlobHandle) {
-		pb := srcRepo.LookupBlob(h.Type, h.ID)
-		copyBlobs.Insert(h)
-		for _, p := range pb {
-			packList.Insert(p.PackID)
+		if _, ok := dstRepo.LookupBlobSize(h.Type, h.ID); !ok {
+			pb := srcRepo.LookupBlob(h.Type, h.ID)
+			copyBlobs.Insert(h)
+			for _, p := range pb {
+				packList.Insert(p.PackID)
+			}
 		}
 	}
 
@@ -217,21 +271,14 @@ func copyTree(ctx context.Context, srcRepo restic.Repository, dstRepo restic.Rep
 				return fmt.Errorf("LoadTree(%v) returned error %v", tree.ID.Str(), tree.Error)
 			}
 
-			// Do we already have this tree blob?
-			treeHandle := restic.BlobHandle{ID: tree.ID, Type: restic.TreeBlob}
-			if _, ok := dstRepo.LookupBlobSize(treeHandle.Type, treeHandle.ID); !ok {
-				// copy raw tree bytes to avoid problems if the serialization changes
-				enqueue(treeHandle)
-			}
+			// copy raw tree bytes to avoid problems if the serialization changes
+			enqueue(restic.BlobHandle{ID: tree.ID, Type: restic.TreeBlob})
 
 			for _, entry := range tree.Nodes {
 				// Recursion into directories is handled by StreamTrees
 				// Copy the blobs for this file.
 				for _, blobID := range entry.Content {
-					h := restic.BlobHandle{Type: restic.DataBlob, ID: blobID}
-					if _, ok := dstRepo.LookupBlobSize(h.Type, h.ID); !ok {
-						enqueue(h)
-					}
+					enqueue(restic.BlobHandle{Type: restic.DataBlob, ID: blobID})
 				}
 			}
 		}
@@ -239,21 +286,20 @@ func copyTree(ctx context.Context, srcRepo restic.Repository, dstRepo restic.Rep
 	})
 	err := wg.Wait()
 	if err != nil {
-		return err
+		return 0, err
 	}
 
-	copyStats(srcRepo, copyBlobs, packList, printer)
+	sizeBlobs := copyStats(srcRepo, copyBlobs, packList, printer)
 	bar := printer.NewCounter("packs copied")
-	err = repository.Repack(ctx, srcRepo, dstRepo, packList, copyBlobs, bar, printer.P)
+	err = repository.CopyBlobs(ctx, srcRepo, dstRepo, uploader, packList, copyBlobs, bar, printer.P)
 	if err != nil {
-		return errors.Fatalf("%s", err)
+		return 0, errors.Fatalf("%s", err)
 	}
-	return nil
+	return sizeBlobs, nil
 }
 
 // copyStats: print statistics for the blobs to be copied
-func copyStats(srcRepo restic.Repository, copyBlobs restic.BlobSet, packList restic.IDSet, printer progress.Printer) {
-
+func copyStats(srcRepo restic.Repository, copyBlobs restic.BlobSet, packList restic.IDSet, printer progress.Printer) uint64 {
 	// count and size
 	countBlobs := 0
 	sizeBlobs := uint64(0)
@@ -267,4 +313,19 @@ func copyStats(srcRepo restic.Repository, copyBlobs restic.BlobSet, packList res
 
 	printer.V("  copy %d blobs with disk size %s in %d packfiles\n",
 		countBlobs, ui.FormatBytes(uint64(sizeBlobs)), len(packList))
+	return sizeBlobs
+}
+
+func copySaveSnapshot(ctx context.Context, sn *data.Snapshot, dstRepo restic.Repository, printer progress.Printer) error {
+	sn.Parent = nil // Parent does not have relevance in the new repo.
+	// Use Original as a persistent snapshot ID
+	if sn.Original == nil {
+		sn.Original = sn.ID()
+	}
+	newID, err := data.SaveSnapshot(ctx, dstRepo, sn)
+	if err != nil {
+		return err
+	}
+	printer.P("snapshot %s saved, copied from source snapshot %s", newID.Str(), sn.ID().Str())
+	return nil
 }
diff --git a/cmd/restic/cmd_copy_integration_test.go b/cmd/restic/cmd_copy_integration_test.go
index c35e960ff..6105acfe4 100644
--- a/cmd/restic/cmd_copy_integration_test.go
+++ b/cmd/restic/cmd_copy_integration_test.go
@@ -7,7 +7,9 @@ import (
 	"testing"
 
 	"github.com/restic/restic/internal/global"
+	"github.com/restic/restic/internal/restic"
 	rtest "github.com/restic/restic/internal/test"
+	"github.com/restic/restic/internal/ui"
 )
 
 func testRunCopy(t testing.TB, srcGopts global.Options, dstGopts global.Options) {
@@ -83,6 +85,41 @@ func TestCopy(t *testing.T) {
 	}
 
 	rtest.Assert(t, len(origRestores) == 0, "found not copied snapshots")
+
+	// check that snapshots were properly batched while copying
+	_, _, countBlobs := testPackAndBlobCounts(t, env.gopts)
+	countTreePacksDst, countDataPacksDst, countBlobsDst := testPackAndBlobCounts(t, env2.gopts)
+
+	rtest.Equals(t, countBlobs, countBlobsDst, "expected blob count in boths repos to be equal")
+	rtest.Equals(t, countTreePacksDst, 1, "expected 1 tree packfile")
+	rtest.Equals(t, countDataPacksDst, 1, "expected 1 data packfile")
+}
+
+func testPackAndBlobCounts(t testing.TB, gopts global.Options) (countTreePacks int, countDataPacks int, countBlobs int) {
+	rtest.OK(t, withTermStatus(t, gopts, func(ctx context.Context, gopts global.Options) error {
+		printer := ui.NewProgressPrinter(gopts.JSON, gopts.Verbosity, gopts.Term)
+		_, repo, unlock, err := openWithReadLock(ctx, gopts, false, printer)
+		rtest.OK(t, err)
+		defer unlock()
+
+		rtest.OK(t, repo.List(context.TODO(), restic.PackFile, func(id restic.ID, size int64) error {
+			blobs, _, err := repo.ListPack(context.TODO(), id, size)
+			rtest.OK(t, err)
+			rtest.Assert(t, len(blobs) > 0, "a packfile should contain at least one blob")
+
+			switch blobs[0].Type {
+			case restic.TreeBlob:
+				countTreePacks++
+			case restic.DataBlob:
+				countDataPacks++
+			}
+			countBlobs += len(blobs)
+			return nil
+		}))
+		return nil
+	}))
+
+	return countTreePacks, countDataPacks, countBlobs
 }
 
 func TestCopyIncremental(t *testing.T) {
diff --git a/doc/045_working_with_repos.rst b/doc/045_working_with_repos.rst
index 75a7e79f1..797ea9f9d 100644
--- a/doc/045_working_with_repos.rst
+++ b/doc/045_working_with_repos.rst
@@ -205,21 +205,28 @@ example from a local to a remote repository, you can use the ``copy`` command:
 
 .. code-block:: console
 
-    $ restic -r /srv/restic-repo-copy copy --from-repo /srv/restic-repo
+    $ restic -r /srv/restic-repo-copy copy --from-repo /srv/restic-repo --verbose
     repository d6504c63 opened successfully
     repository 3dd0878c opened successfully
+    [0:00] 100.00%  2 / 2 index files loaded
+    [0:00] 100.00%  7 / 7 index files loaded
 
     snapshot 410b18a2 of [/home/user/work] at 2020-06-09 23:15:57.305305 +0200 CEST by user@kasimir
       copy started, this may take a while...
-    snapshot 7a746a07 saved
+    [0:00] 100.00%  13 / 13 packs copied
 
     snapshot 4e5d5487 of [/home/user/work] at 2020-05-01 22:44:07.012113 +0200 CEST by user@kasimir
     skipping snapshot 4e5d5487, was already copied to snapshot 50eb62b7
 
+    snapshot 7a746a07 saved, copied from source snapshot 410b18a2
+
 The example command copies all snapshots from the source repository
 ``/srv/restic-repo`` to the destination repository ``/srv/restic-repo-copy``.
 Snapshots which have previously been copied between repositories will
-be skipped by later copy runs.
+be skipped by later copy runs. Information about skipped snapshots is only
+printed when ``--verbose`` is passed to the command. For efficiency reasons,
+the snapshots are copied in batches, such that the ``snapshot [...] saved``
+messages can appear some time after the snapshot content was copied.
 
 .. important:: This process will have to both download (read) and upload (write)
     the entire snapshot(s) due to the different encryption keys used in the
@@ -353,7 +360,7 @@ modifying the repository. Instead restic will only print the actions it would
 perform.
 
 .. note:: The ``rewrite`` command verifies that it does not modify snapshots in
-    unexpected ways and fails with an ``cannot encode tree at "[...]" without losing information``
+    unexpected ways and fails with an ``cannot encode tree at "[...]" without loosing information``
     error otherwise. This can occur when rewriting a snapshot created by a newer
     version of restic or some third-party implementation.
 
diff --git a/internal/backend/local/local_windows.go b/internal/backend/local/local_windows.go
index fa21d8240..b3677b0ef 100644
--- a/internal/backend/local/local_windows.go
+++ b/internal/backend/local/local_windows.go
@@ -24,7 +24,7 @@ func removeFile(f string) error {
 	// as Windows won't let you delete a read-only file
 	err := os.Chmod(f, 0666)
 	if err != nil && !os.IsPermission(err) {
-		 return errors.WithStack(err)
+		return errors.WithStack(err)
 	}
 
 	return os.Remove(f)
diff --git a/internal/repository/index/master_index.go b/internal/repository/index/master_index.go
index 62ccc4f71..f410ebf61 100644
--- a/internal/repository/index/master_index.go
+++ b/internal/repository/index/master_index.go
@@ -16,13 +16,13 @@ import (
 // MasterIndex is a collection of indexes and IDs of chunks that are in the process of being saved.
 type MasterIndex struct {
 	idx          []*Index
-	pendingBlobs restic.BlobSet
+	pendingBlobs map[restic.BlobHandle]uint
 	idxMutex     sync.RWMutex
 }
 
 // NewMasterIndex creates a new master index.
 func NewMasterIndex() *MasterIndex {
-	mi := &MasterIndex{pendingBlobs: restic.NewBlobSet()}
+	mi := &MasterIndex{pendingBlobs: make(map[restic.BlobHandle]uint)}
 	mi.clear()
 	return mi
 }
@@ -46,10 +46,16 @@ func (mi *MasterIndex) Lookup(bh restic.BlobHandle) (pbs []restic.PackedBlob) {
 }
 
 // LookupSize queries all known Indexes for the ID and returns the first match.
+// Also returns true if the ID is pending.
 func (mi *MasterIndex) LookupSize(bh restic.BlobHandle) (uint, bool) {
 	mi.idxMutex.RLock()
 	defer mi.idxMutex.RUnlock()
 
+	// also return true if blob is pending
+	if size, ok := mi.pendingBlobs[bh]; ok {
+		return size, true
+	}
+
 	for _, idx := range mi.idx {
 		if size, found := idx.LookupSize(bh); found {
 			return size, found
@@ -63,13 +69,13 @@ func (mi *MasterIndex) LookupSize(bh restic.BlobHandle) (uint, bool) {
 // Before doing so it checks if this blob is already known.
 // Returns true if adding was successful and false if the blob
 // was already known
-func (mi *MasterIndex) AddPending(bh restic.BlobHandle) bool {
+func (mi *MasterIndex) AddPending(bh restic.BlobHandle, size uint) bool {
 
 	mi.idxMutex.Lock()
 	defer mi.idxMutex.Unlock()
 
 	// Check if blob is pending or in index
-	if mi.pendingBlobs.Has(bh) {
+	if _, ok := mi.pendingBlobs[bh]; ok {
 		return false
 	}
 
@@ -80,30 +86,10 @@ func (mi *MasterIndex) AddPending(bh restic.BlobHandle) bool {
 	}
 
 	// really not known -> insert
-	mi.pendingBlobs.Insert(bh)
+	mi.pendingBlobs[bh] = size
 	return true
 }
 
-// Has queries all known Indexes for the ID and returns the first match.
-// Also returns true if the ID is pending.
-func (mi *MasterIndex) Has(bh restic.BlobHandle) bool {
-	mi.idxMutex.RLock()
-	defer mi.idxMutex.RUnlock()
-
-	// also return true if blob is pending
-	if mi.pendingBlobs.Has(bh) {
-		return true
-	}
-
-	for _, idx := range mi.idx {
-		if idx.Has(bh) {
-			return true
-		}
-	}
-
-	return false
-}
-
 // IDs returns the IDs of all indexes contained in the index.
 func (mi *MasterIndex) IDs() restic.IDSet {
 	mi.idxMutex.RLock()
@@ -165,7 +151,7 @@ func (mi *MasterIndex) storePack(id restic.ID, blobs []restic.Blob) {
 
 	// delete blobs from pending
 	for _, blob := range blobs {
-		mi.pendingBlobs.Delete(restic.BlobHandle{Type: blob.Type, ID: blob.ID})
+		delete(mi.pendingBlobs, restic.BlobHandle{Type: blob.Type, ID: blob.ID})
 	}
 
 	for _, idx := range mi.idx {
diff --git a/internal/repository/index/master_index_test.go b/internal/repository/index/master_index_test.go
index edf2067b9..98cfe9ac6 100644
--- a/internal/repository/index/master_index_test.go
+++ b/internal/repository/index/master_index_test.go
@@ -74,9 +74,6 @@ func TestMasterIndex(t *testing.T) {
 	mIdx.Insert(idx2)
 
 	// test idInIdx1
-	found := mIdx.Has(bhInIdx1)
-	rtest.Equals(t, true, found)
-
 	blobs := mIdx.Lookup(bhInIdx1)
 	rtest.Equals(t, []restic.PackedBlob{blob1}, blobs)
 
@@ -85,9 +82,6 @@ func TestMasterIndex(t *testing.T) {
 	rtest.Equals(t, uint(10), size)
 
 	// test idInIdx2
-	found = mIdx.Has(bhInIdx2)
-	rtest.Equals(t, true, found)
-
 	blobs = mIdx.Lookup(bhInIdx2)
 	rtest.Equals(t, []restic.PackedBlob{blob2}, blobs)
 
@@ -96,9 +90,6 @@ func TestMasterIndex(t *testing.T) {
 	rtest.Equals(t, uint(200), size)
 
 	// test idInIdx12
-	found = mIdx.Has(bhInIdx12)
-	rtest.Equals(t, true, found)
-
 	blobs = mIdx.Lookup(bhInIdx12)
 	rtest.Equals(t, 2, len(blobs))
 
@@ -121,8 +112,6 @@ func TestMasterIndex(t *testing.T) {
 	rtest.Equals(t, uint(80), size)
 
 	// test not in index
-	found = mIdx.Has(restic.BlobHandle{ID: restic.NewRandomID(), Type: restic.TreeBlob})
-	rtest.Assert(t, !found, "Expected no blobs when fetching with a random id")
 	blobs = mIdx.Lookup(restic.NewRandomBlobHandle())
 	rtest.Assert(t, blobs == nil, "Expected no blobs when fetching with a random id")
 	_, found = mIdx.LookupSize(restic.NewRandomBlobHandle())
@@ -521,7 +510,7 @@ func TestRewriteOversizedIndex(t *testing.T) {
 
 	// verify that blobs are still in the index
 	for _, blob := range blobs {
-		found := mi2.Has(blob.BlobHandle)
+		_, found := mi2.LookupSize(blob.BlobHandle)
 		rtest.Assert(t, found, "blob %v missing after rewrite", blob.ID)
 	}
 
diff --git a/internal/repository/prune.go b/internal/repository/prune.go
index 250ab9846..772765129 100644
--- a/internal/repository/prune.go
+++ b/internal/repository/prune.go
@@ -105,7 +105,7 @@ func PlanPrune(ctx context.Context, opts PruneOptions, repo *Repository, getUsed
 	if repo.Config().Version < 2 && opts.RepackUncompressed {
 		return nil, fmt.Errorf("compression requires at least repository format version 2")
 	}
-	if opts.SmallPackBytes > uint64(repo.packSize()) {
+	if opts.SmallPackBytes > uint64(repo.PackSize()) {
 		return nil, fmt.Errorf("repack-smaller-than exceeds repository packsize")
 	}
 
@@ -329,12 +329,12 @@ func decidePackAction(ctx context.Context, opts PruneOptions, repo *Repository,
 	var repackSmallCandidates []packInfoWithID
 	repoVersion := repo.Config().Version
 	// only repack very small files by default
-	targetPackSize := repo.packSize() / 25
+	targetPackSize := repo.PackSize() / 25
 	if opts.SmallPackBytes > 0 {
 		targetPackSize = uint(opts.SmallPackBytes)
 	} else if opts.RepackSmall {
 		// consider files with at least 80% of the target size as large enough
-		targetPackSize = repo.packSize() / 5 * 4
+		targetPackSize = repo.PackSize() / 5 * 4
 	}
 
 	// loop over all packs and decide what to do
@@ -563,7 +563,9 @@ func (plan *PrunePlan) Execute(ctx context.Context, printer progress.Printer) er
 	if len(plan.repackPacks) != 0 {
 		printer.P("repacking packs\n")
 		bar := printer.NewCounter("packs repacked")
-		err := Repack(ctx, repo, repo, plan.repackPacks, plan.keepBlobs, bar, printer.P)
+		err := repo.WithBlobUploader(ctx, func(ctx context.Context, uploader restic.BlobSaver) error {
+			return CopyBlobs(ctx, repo, repo, uploader, plan.repackPacks, plan.keepBlobs, bar, printer.P)
+		})
 		if err != nil {
 			return errors.Fatalf("%s", err)
 		}
diff --git a/internal/repository/repack.go b/internal/repository/repack.go
index 730325afd..ca0a8a48b 100644
--- a/internal/repository/repack.go
+++ b/internal/repository/repack.go
@@ -21,17 +21,18 @@ type repackBlobSet interface {
 
 type LogFunc func(msg string, args ...interface{})
 
-// Repack takes a list of packs together with a list of blobs contained in
+// CopyBlobs takes a list of packs together with a list of blobs contained in
 // these packs. Each pack is loaded and the blobs listed in keepBlobs is saved
 // into a new pack. Returned is the list of obsolete packs which can then
 // be removed.
 //
-// The map keepBlobs is modified by Repack, it is used to keep track of which
+// The map keepBlobs is modified by CopyBlobs, it is used to keep track of which
 // blobs have been processed.
-func Repack(
+func CopyBlobs(
 	ctx context.Context,
 	repo restic.Repository,
 	dstRepo restic.Repository,
+	dstUploader restic.BlobSaver,
 	packs restic.IDSet,
 	keepBlobs repackBlobSet,
 	p *progress.Counter,
@@ -49,9 +50,7 @@ func Repack(
 		return errors.New("repack step requires a backend connection limit of at least two")
 	}
 
-	return dstRepo.WithBlobUploader(ctx, func(ctx context.Context, uploader restic.BlobSaver) error {
-		return repack(ctx, repo, dstRepo, uploader, packs, keepBlobs, p, logf)
-	})
+	return repack(ctx, repo, dstRepo, dstUploader, packs, keepBlobs, p, logf)
 }
 
 func repack(
diff --git a/internal/repository/repack_test.go b/internal/repository/repack_test.go
index 4d285681f..bedacaa7e 100644
--- a/internal/repository/repack_test.go
+++ b/internal/repository/repack_test.go
@@ -150,7 +150,9 @@ func findPacksForBlobs(t *testing.T, repo restic.Repository, blobs restic.BlobSe
 }
 
 func repack(t *testing.T, repo restic.Repository, be backend.Backend, packs restic.IDSet, blobs restic.BlobSet) {
-	rtest.OK(t, repository.Repack(context.TODO(), repo, repo, packs, blobs, nil, nil))
+	rtest.OK(t, repo.WithBlobUploader(context.TODO(), func(ctx context.Context, uploader restic.BlobSaver) error {
+		return repository.CopyBlobs(ctx, repo, repo, uploader, packs, blobs, nil, nil)
+	}))
 
 	for id := range packs {
 		rtest.OK(t, be.Remove(context.TODO(), backend.Handle{Type: restic.PackFile, Name: id.String()}))
@@ -263,7 +265,9 @@ func testRepackCopy(t *testing.T, version uint) {
 	_, keepBlobs := selectBlobs(t, random, repo, 0.2)
 	copyPacks := findPacksForBlobs(t, repo, keepBlobs)
 
-	rtest.OK(t, repository.Repack(context.TODO(), repoWrapped, dstRepoWrapped, copyPacks, keepBlobs, nil, nil))
+	rtest.OK(t, repoWrapped.WithBlobUploader(context.TODO(), func(ctx context.Context, uploader restic.BlobSaver) error {
+		return repository.CopyBlobs(ctx, repoWrapped, dstRepoWrapped, uploader, copyPacks, keepBlobs, nil, nil)
+	}))
 	rebuildAndReloadIndex(t, dstRepo)
 
 	for h := range keepBlobs {
@@ -299,7 +303,9 @@ func testRepackWrongBlob(t *testing.T, version uint) {
 	_, keepBlobs := selectBlobs(t, random, repo, 0)
 	rewritePacks := findPacksForBlobs(t, repo, keepBlobs)
 
-	err := repository.Repack(context.TODO(), repo, repo, rewritePacks, keepBlobs, nil, nil)
+	err := repo.WithBlobUploader(context.TODO(), func(ctx context.Context, uploader restic.BlobSaver) error {
+		return repository.CopyBlobs(ctx, repo, repo, uploader, rewritePacks, keepBlobs, nil, nil)
+	})
 	if err == nil {
 		t.Fatal("expected repack to fail but got no error")
 	}
@@ -346,7 +352,9 @@ func testRepackBlobFallback(t *testing.T, version uint) {
 	}))
 
 	// repack must fallback to valid copy
-	rtest.OK(t, repository.Repack(context.TODO(), repo, repo, rewritePacks, keepBlobs, nil, nil))
+	rtest.OK(t, repo.WithBlobUploader(context.TODO(), func(ctx context.Context, uploader restic.BlobSaver) error {
+		return repository.CopyBlobs(ctx, repo, repo, uploader, rewritePacks, keepBlobs, nil, nil)
+	}))
 
 	keepBlobs = restic.NewBlobSet(restic.BlobHandle{Type: restic.DataBlob, ID: id})
 	packs := findPacksForBlobs(t, repo, keepBlobs)
diff --git a/internal/repository/repository.go b/internal/repository/repository.go
index bb9c6c3ba..3b26b1f90 100644
--- a/internal/repository/repository.go
+++ b/internal/repository/repository.go
@@ -154,8 +154,8 @@ func (r *Repository) Config() restic.Config {
 	return r.cfg
 }
 
-// packSize return the target size of a pack file when uploading
-func (r *Repository) packSize() uint {
+// PackSize return the target size of a pack file when uploading
+func (r *Repository) PackSize() uint {
 	return r.opts.PackSize
 }
 
@@ -590,8 +590,8 @@ func (r *Repository) startPackUploader(ctx context.Context, wg *errgroup.Group)
 	innerWg, ctx := errgroup.WithContext(ctx)
 	r.packerWg = innerWg
 	r.uploader = newPackerUploader(ctx, innerWg, r, r.Connections())
-	r.treePM = newPackerManager(r.key, restic.TreeBlob, r.packSize(), r.packerCount, r.uploader.QueuePacker)
-	r.dataPM = newPackerManager(r.key, restic.DataBlob, r.packSize(), r.packerCount, r.uploader.QueuePacker)
+	r.treePM = newPackerManager(r.key, restic.TreeBlob, r.PackSize(), r.packerCount, r.uploader.QueuePacker)
+	r.dataPM = newPackerManager(r.key, restic.DataBlob, r.PackSize(), r.packerCount, r.uploader.QueuePacker)
 
 	wg.Go(func() error {
 		return innerWg.Wait()
@@ -640,7 +640,7 @@ func (r *Repository) LookupBlob(tpe restic.BlobType, id restic.ID) []restic.Pack
 	return r.idx.Lookup(restic.BlobHandle{Type: tpe, ID: id})
 }
 
-// LookupBlobSize returns the size of blob id.
+// LookupBlobSize returns the size of blob id. Also returns pending blobs.
 func (r *Repository) LookupBlobSize(tpe restic.BlobType, id restic.ID) (uint, bool) {
 	return r.idx.LookupSize(restic.BlobHandle{Type: tpe, ID: id})
 }
@@ -968,7 +968,7 @@ func (r *Repository) saveBlob(ctx context.Context, t restic.BlobType, buf []byte
 	}
 
 	// first try to add to pending blobs; if not successful, this blob is already known
-	known = !r.idx.AddPending(restic.BlobHandle{ID: newID, Type: t})
+	known = !r.idx.AddPending(restic.BlobHandle{ID: newID, Type: t}, uint(len(buf)))
 
 	// only save when needed or explicitly told
 	if !known || storeDuplicate {
diff --git a/internal/restic/repository.go b/internal/restic/repository.go
index cf3ec7834..2f1373641 100644
--- a/internal/restic/repository.go
+++ b/internal/restic/repository.go
@@ -18,6 +18,7 @@ type Repository interface {
 	// Connections returns the maximum number of concurrent backend operations
 	Connections() uint
 	Config() Config
+	PackSize() uint
 	Key() *crypto.Key
 
 	LoadIndex(ctx context.Context, p TerminalCounterFactory) error