For backups, I have two git-annex [1] repositories,
- Personal files, stuff I can not afford to lose (photos,documents etc.) - Full archive on S3, full archive on a home server, 4 clients with partial copies.
- Big data stuff I can afford to lose (VM images, media files etc.) - Around 6 TB, each file has two copies split between 5 hard drives on home server and Hubic.