When would a backup be "partial"?

I went into a backup to restore, and from the drop-down, I see some backups are “partial”

What does this mean? I can see that when I choose them, not the entire content of C: drive exists, just two or this directories.

When would a backup become “partial”?

It happens when the backup is stopped for some reason, before running to completion.

Duplicati will then essentially:

  • Copy all files from previous backup
  • Update anything that was processed in this run
  • Mark the backup as “partial”

You should still see all files (but the sizes here reveals that is not the case).