The intent here is to make the text more consistent in its use of different
concepts involved in explaining the idea and setup that is explained, and
to make it easier to follow.
We're also replacing rclone with rest-server, not because we dislike rclone
but in order to keep the text to the basic tooling and the main restic eco-
system.
Finally we also remove the previous tip at the end about keeping the SSH tunnel
up, as it will be during the time the SSH session is running (in which the user
is expected to run the restic commands).
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