A spool copy is used as a temporary holding area for data until it is copied to an active synchronous copy.
Spool copy has a retention rule of 0 days and 0 cycles. Hence, when an Auxiliary Copy job is run:
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All the data (backup jobs) on the spool copy is copied to the secondary copy.
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The data on the spool copy is pruned immediately and the space on the spool copy is available for new backup jobs.
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For snapshots, if you perform a backup copy operation or copy the data to a replication or vault copy, then data will be aged automatically. If you do not copy the data to these copies, then you need to manually age the data.
Spool copies are recommended on disk libraries that have limited resources and capacity available on the disk.