Inspect one/all of those hashnamed directories in moodledata/temp/backup/
See if there is a backup.mbz file there along with a moodle_backup.xml
If the backup.mbz file is there it failed on the last step of the auto-backup which is to copy ... that's copy ... the backup.mbz to your specified location. If you did not specify a location then it's going into the sea of files: moodledata/filedir/
You can manually remove anything in moodledata/temp/backup/ - no ill affects.
So the auto takes 22 hours to complete? How many courses do you have to backup?
Is it failing on same courses?
Think I've suggested this before ... might have to turn off auto in Moodle and make your own 'autobackup' bash shell scripts that loop though a listing of course ID's (cids) and uses the cli backup.php script.
You might have 'large' (cids of largest courses), 'medium' (ditto but medium size), 'small' (ditto but small) scripts.
'SoS', Ken
by Ken Task.