We are reviewing our backup policies.
We have ( I think) the two safety nets of Server Backup and Site Backup managed by ULCC. We have never had to use them and I hope we never will. This question is more about 'Course backups' and whether and how you provide a service to your users through automated Course Backups.

I am imagining the scenario where a teacher has trashed a course, or overwritten some marks, and comes to the central service hoping we can restore the last good version. Our 'alternative VLE'  (web publishing tool) allows for backup/restoration after every edit, so expectations are already higher than we can hope to match.

I originally set it to backup all courses  every weekday night at 2am, and to keep 5 versions. I understand that Moodle only makes a new backup where there has been activity, so it is 'efficient'. However this is a course backup- and files are included. Where we have assignments coming in from 200 students on a course, this can be huge. We bought an extra 200Gb from ULCC and reduced down to keeping just the most recent  (last night's) version.

I am also conscious that the act of backing up is disruptive for those students who use the system at 2am - and there's more of those than I had expected. I am wondering whether 5am might be a better choice, but nothing is going to be a good choice as we increasingly put on courses for international students.

Has anyone got a backup policy that is an effective compromise between risk and space?