Upgrade requirements for SnapMirror - NetApp
library.netapp.com › ecmdocs › ECMP1368868The requirement to upgrade SnapMirror destination volumes first does not apply to SnapMirror for qtree replication, SnapVault, or data restoration for tape using the restore command. However, when you upgrade systems that use these features, you should upgrade your SnapMirror destination systems, SnapVault secondary systems, and restoration target systems before the corresponding source systems to maintain backward compatibility.