Backup storage option if solely used CEPH with Proxmox

Hello wonderful Proxmox Community,
Could anybody tell me what would be the best backup option in CEPH RBD Shared Storage only environment? Currently all my VMs are on RBD and i do full backup once a week on OmniOS NFS shared storage. If i want to go with RBD only environment how would i go about with backup. I did some Snapshots of VMs. Can this be used as substitute of full backup since CEPH itself is resiliant enough to withstand any sort hdd or whole host outage? I can still stick with RBD+NFS environment, just wandering what other option are there.

Thanks!