For every storage drive I have two backup drives. One of them I store in my home (but not connected to my computer) and one of them is stored encrypted (FileVault full disk encryption) at my friends place.

I use this to backup:

rsync -vaxXES --delete --backup --backup-dir="/Volumes/backup/__rsync/$(date +"%Y-%m-%d_%H%M%S")/" --log-file="/Volumes/backup/__rsync/$(date +"%Y-%m-%d_%H%M%S").log" --exclude="__rsync/" --exclude=".Trash/" --exclude=".Trashes/" --exclude=".Spotlight-V100" --exclude=".fseventsd/" --exclude=".DocumentRevisions-V100/" --exclude=".TemporaryItems/" /Volumes/data/ /Volumes/backup/

Sometimes i delete stuff in the __rsync dir manually.

I've tried Crashplan and Backblaze, but they're crazy slow from Sweden.