I have one idea, based on my experience yesterday.

I renamed the /home/scohen/Taormina directory and then created a new
directory of that name on the remote drive. A quick check of disk space
informed me that I would not have enough room for a full backup on the
remote drive. So I looked more closely and saw that there were a lot of
very old backups under another directory that I could easily do without
on the drive, and deleted those, ran the backup successfully.

My idea is this: what happens if there is not enough room to complete
the backup on the intended drive? What error message does duplicity give
in that case? I have no memory of any particular error message on
2021/10/07, though I do remember a problem, and being unable to solve it
then, I simply gave up on backups for awhile, which I hoped to get back
to with 22.04.

My idea is that this situation could lead to a truncated backup file,
and if the error message were not clear, confusion on the part of the
user. If a backup fails due to lack of disk space on the destination, a
specific error message to that effect would be useful. I don't know if
that's what happened here but it could be.

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https://bugs.launchpad.net/bugs/1970124

Title:
  duplicity backup fails with obscure error message Ubuntu 22.04

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