Snapshots are created on request via CLI or API. There is no default frequency.
There is a separate service that can create regular snapshots and apply retention policies on the local or remote cluster. There is no default frequency, as is defined in the snapshot policy. While StorPool can create snapshots with no performance degradation, practical use cases are with hourly and daily snapshots.
StorPool, StorPool [SDS]/19.01, x86
Snapshot Frequency, Points-in-Time, Data Availability