DVD rips are stored on my ReadyNAS Ultra 4 with 4x2TB disks in a RAID 5. I didn't finish ripping my collection before my move, but with what I have there, it looks like it may be enough space, as long as I relocate my now rather large Time Machine backups back to the older NV+.

What I may do one day is use one of the DVD reprocessing tools to strip out foreign languages and other features I don't want to save space. As for backups, I figure the physical discs are good enough if the NAS manages to suffer more then a single drive failure.