Github user mrunalinikankariya commented on the issue:
https://github.com/apache/cloudstack/pull/1740
In ACS, all the snapshots are deleted from primary storage as soon as it is
successfully backed up and copied on secondary storage, hence this issue is not
valid for ACS.
However a ticket should be raised to analysis and understand how
incremental snapshots work if not a single copy kept on primary.
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