I use Back in Time to backup to my NAS for a ‘time machine’. Works great. I tried Flyback, but there was some problem with it. I think it was that it didn’t work with NFS for some reason.
Back In Time works great for me as well. I’ve run some tests with it, and it seems to do exactly what it says it does. I have’t made it to the point yet, where it completely fills up the backup volume and has to scavenge for space though. I set up the rotation so that it would keep today, yesterday, 1 week ago, monthlies until a year, then annuals. Kinda like that setup, and it would work for most anything I’d ever want to restore.