Welcome!
And for others ... who might see that error ... permissions on moodledata/temp/backup were pretty restrictive ... making them more 'liberal' did the trick. Able to access that area via cPanel and removed many folders/files. Also manually removed contents of moodledata/trashdir/ to speed things up a bit.
Josh also had a 'space crunch' ... automated backups turned on and saving not to a designated directory but filedir. 30 gig space getting closer to filling up.
Admin person doesn't have any tool in core that shows disk info ... space used and space available. Also no core tool for the admin to see all the autobackups and ability to 'control them' ... have to go into each course, pretend to restore, to be able to see and delete the extra autobackup files one doesn't need.
Those backups numbered about 15 and were in the over 500MB ranges (around there) with most recent backups larger than the earlier ones. Saving grace ... not many courses.
That's a quick summary .... ain't admin of a Moodle grand! :|
'SoS', Ken