Open Stack

Full disclosure, I have zero experience with openstack so far.

If I am going to use a Ceph RBD cluster to store my guest instances, how 
should I be doing backups?

1) I would prefer them to be incremental so that a whole backup doesnt 
have to happen every night.
2) I would also like the instances to obviously stay online
3) Backups will be stored off the ceph cluster on slower sata drives.

Thanks,
Mark