Haha yea but it is a reasonable solution.
If that's too "old school", you could get a BD-burner, burn backups to ISO and burn 5 of them at a time to a 25GB BD, or 12 of them to a 50GB BD.
I still backup a lot of things to DVD. No point in wasting hard drive space on something I rarely (if ever) need.
EDIT: you can get 100 discs for $25, so about 450GB for $25. Cheapest option imo.