Comment What's wrong with rsync? (Score 1) 983
Steps:
1 - Get a RAID similar to your main storage to use as backup.
2 - Put the second RAID in a relative's house, where you can get access to it.
3 - Have this backup run an rsync over ssh once a week/month, pointing at your main storage array.
With proper ssh key exchange set up ahead of time and using an ssh username and port that are non-obvious (with ssh on your main system only allowing known keys and not username/password combinations), you'll do pretty well against everyone except a malignant government entity.