My setup is:
Server: debian 12 with urbackup 2.5.33
Client: debian 12 with latest client
Mode: active/internet
Snapshot: device-mapper
Directory: /var/lib/docker|Docker/require_snapshot
Backup is done successfully, however, each time I get a warning like in title. Here are logs:
Info
Starting scheduled incremental file backup...
Info
Snapshotting device /dev/mapper/root-98d1f8b1f435 via dm...
Info
Creating snapshot device...
Info
Mounting /dev/mapper/root-98d1f8b1f435-57d3d0c74f81494de718f1e5601aa9158dde0f735b6596b0-wsnap...
Warnings
Error opening file to lock: //.overlay_2fefd007-3e48-4162-b2c6-45ccdda22f37_57d3d0c74f81494de718f1e5601aa9158dde0f735b6596b0. Operation not permitted (code: 1)
Info
Scanning for changed hard links on volume of "/"...
Info
Indexing of "Docker" done. 8374 filesystem lookups 0 db lookups and 6 db updates
Info
seller-t2: Loading file list...
(There are more logs which are all 'info' so I've stripped them out. No more warnings/errors)