Likewise, if something was not write intensive, or not being updated, this could be a good idea because it is a lower cost solution. But it still relies on the primary storage being available because until we’ve moved all of that data to our other area, if this failed, we’ve lost everything. We have to be careful where we use snapshots.
We wouldn’t typically use this for write intensive applications and we wouldn’t use it to protect us against primary storage failure. But it gives us a consistent usable copy of data that we can use to take a backup or do some form of data migration from.
It’s low cost because we only replicate or copy changed data.