Why would server have problem opening it's own files?

I see these errors in the Server log regularly.
What would cause them?
Server is 2.2.8 on Debian Stretch.

Error getting complete file “TW0jILHw12SHFrsNIGFD|root/var/urbackup/clientlist_b_71.ub” from . Errorcode: CANNOT_OPEN_FILE (3)

You should exclude /var/urbackup/* from the backups :slight_smile: