In SnapMirror relationships, the volume designated as the destination remains available in an online read-only state. Instead of working with storage on the file level or otherwise, SnapMirror accesses physical blocks, meaning the destination replica is an identical copy of source volume, including all of its contents and settings. When using Cloud Volumes ONTAP’s data deduplication and data compression storage efficiencies, those optimizations will also be in place in the replica. Read more about How does SnapMirror data replication work