Hi @netappmagic ,
"Which means selectively snapmirror snapshots over to Altavault?"
snapmirror snapshots refered here is the snaphsot created using snapshot policy ?
Netapp unified replication(XDP) is used for replication from Ontap to Altvault.
Snapshots created on source volume using "snapshot policy" with snapmirror lables Can be controlled /transfered to Altvault using rules (snapmirror labels) specified in the "snapmirror policy" assinged to the relation .
Snapshot policy and Snapmirror policy should be created on source Ontap Controller.