Yes this is probably connected, so the question is why it cannot open the temporary file where it put the metadata. Maybe something deleted the temporary files during backup?
Once a day I have a a cron job that removes files that haven’t been accessed for more than 7 days, but that shouldn’t cause an issue in this case. As far as I’m aware nothing else is clearing those files.
Is it possible for me to change the tmp files directory for the Urbackup client?