I have a ZFS filseystem and create weekly snapshots over a period of 5 weeks called week01, week02, week03, week04 and week05 respectively. Ny question is: how do the snapshots relate to each other - does week03 contain the changes made since week02 or does it contain all the changes made since the first snapshot, week01, and therefore includes those in week02?

To rollback to week03, it's necesaary to delete snapshots week04 and week05 first but what if week01 and week02 have also been deleted - will the rollback still work or is it ncessary to keep earlier snapshots?

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