Encrypted ZFS for off-site backups 
As I recently discussed, I use zfs replication for my off-site backups, manually moving volumes from my home to a second location on a semi-regular schedule. Of course, I would rather that if one of these drives were stolen or lost that the thief not have a copy of all my data. Therefore, I use geli to encrypt the entire zpool.
Decrypting geli volumes with portable software 
Benchmarking ungeli on real data