Backup vs rbd export

[iva-a-an]

Hi There,

I'm woundering is there faster way todo backups from CEPH rbd pool?
I have a ZFS as backup storage connected over NFS protocol with 10G network to Proxmox . ZFS has 12 Sata Drives in raidz
When I do backup via proxmox tool then writing speed to ZFS is 10-15 MBs only
But when I use rbd export, then my writing speed is 100-350MB/s

Thanks