What is snapdiff ?

Snapdiff is the Netapp mechanism to create snapshot of a volume. These snapshots are monted on a proxy for backup. This functionality can be used to backup shares in incremental. So we 'll use a normal stgpool on Spectrum Protect server, and versioning will apply.

We need additional server with TSM client installed

• (Windows) The snapdiff option is for backing up NAS/N-Series file server volumes that are CIFS attached.
• (Linux) The snapdiff option is for backing up NAS/N-Series file server volumes that are NFS attached.

https://www.ibm.com/support/knowledgecenter/SSEQVQ_8.1.7/client/c_cfg_snapmirror_supt_netapp_snapdiff.html