It is important to understand the risk of having them live longer: Not only do they consume space, but they also tend to cause a performance hit, if not designed properly. Most often they will be deleted based on a 7-day retention schedule. Snapshots are designed to be used as recovery points during changes to an underlying volume. This minimizes the time required to create the snapshot and saves on storage costs by not duplicating data. Snapshots are incremental data copies, which means that only the blocks on the device that have changed after your most recent snapshot are saved.
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