No, the fsck / delete actions aren't mentioned in the log. In the log I can only see:
full|incr backup started for share xxxxx
full|incr backup NNN complete, xxxxxx files, yyyyy bytes
Perhaps yours does the fsck too, but just very quickly so it may not be noticeable. Try running a backup manually, either full/incremental then watch the "Status" page. During the fsck, the "Host Summary" page will say "Backup in progress" whilst the "Status" page shows the actual task being performed, i.e. backing up, fsck, delete, etc. It would be best to try this on a host that has lots of files (1 million files+) and when you have more than 5 backups.
Regards,
Jimmy