by Ken Task.
Version of Moodle? Hosted on?
Site Admin -> Reports -> Backups
But not sure you'll see much detail there.
Might have to explore moodledata/temp/backup directory and look for any .log files by contenthashed names (bunch of letters/numbers) over 0 bytes in size. They are text and can be opened with any text editor - not to edit but to view contents. Can't tell you what you'll find there, but there might be some clues for usage in troubleshooting (if required).
'spirit of sharing', Ken