>> You apparently performed a full backup on 2016-11-29 at 01:52 UTC,
>> did everything work fine during this backup? Was it successful ?
> Don't think so

Don't think so either, because your full backup on that date is only one
volume long and that volume is 120 bytes long:

  ls -l /home/david/Dropbox/Backups
  [...]
  ... 120 Nov 28 17:52 duplicity-full.20161129T015237Z.vol1.difftar.gz
  [...]

FYI duplicity makes backups into sets of normally 25 MB volumes.

And then there's your first incremental backup on Dec 1 which doesn't
look good since there are only volumes 2, 7, 15, 16, 23, 41, 49 of that
backup set in your backup repository. Where are all the other ones? Did
Dropbox eat them? And the normally-accompanying signatures and manifest
files are nowhere to be found either.

I don't know if Déjà-Dup can recover from this situation and finish the
partial incremental backup set but I wouldn't even lose time trying to
be honest. I've always found the easiest way to recover from a severely
failed backup is to delete the failed part (everything in your case) and
start again. For good measure you can also delete the backup's cache
directory:

  rm -r /home/david/Dropbox/Backups
  rm -r /home/david/.cache/deja-dup/f00ff76508010e2a830dd26b1d39db42

When you try again, you may want to test backing up a small subset of
your documents instead of your whole user directory. That way you'll
know quickly if it works or fails again. If it works, you can delete
this test backup and start again with the whole thing.

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https://bugs.launchpad.net/bugs/1652410

Title:
  Undescriptive duplicity/collection-status error when the backup
  directory contains two volumes with different file names and same
  volume number in the same backup set

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