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Taking Kolla outside this game, this is more an OPs tasks for any deployment type.

Removing all services (including data) is not recoverable from OpenStack point of view. Backups or external storage for the snapshots is required in order to recover snapshots.

Being that said. You can store snaphsots file in a external media, partition not managed by kolla or any other place that allows you to import again the data.

Keeping the snapshots in the same volume as the destination data wont work because nova/cinder does not know about those snapshots until are imported.