When running *.rdiff backup.

== fatal errors from /etc/backup.d/90.ssd.rdiff ==

Info: Removing backups older than 10D days succeeded.
Error: Warning: Access Control List file not found
Warning: Extended Attributes file not found
Fatal: Failed backup up source

backupninja is using *rdiff-backup* utility. SOLUTION: remove destination backup and backup it again (probably rdiff-backup version mismatch)