Daily backups tend to fill up lots of disk space. We need a pref for:

1) How often backups are made
2) How many backups are kept.

For the 'how many backups are kept' feature, it would be neat if we could have something like:

"Archive all backups for 'x' days"
"Archive weekly backups for 'x' weeks"
"Årchive montly backups for 'x' months".

So an admin could have Confluence keep, say, every backup for the last week, then once-per-week backups for the last six weeks, then montly backups for the last year.