I got this error after a comms problem whilst backing up to OneDrive for Business. It seems that Duplicati is not handeling comms issues well and corupts it’s own database. I’m trying a rebuild of the database to get round the problem, but last time I had to start the backups again.
If you have specifics (ideally a log file or database bug report or reproducible steps), that’d help find issue.
I’ve been throwing artificial comms failures at Duplicati for awhile, but I can’t see this particular problem…
It’s hard to reproduce an internet failiour in the middle of a backup. I’m happy to say the a delete and rebuild of the database fixed the error for me this time. Last time I had to recreate the backup.