ZFS with snapshots on the targeted machine is a great mitigation but not a silver bullet. Snapshots can expire or be overwritten by new encrypted data until good data is lost (depending on the configuration). Or the ransomware attack could be block level, which is hitting a lot of people lately. Or the machine could explode :) I think snapshots should be considered as a way to restore point-in-time data locally, not as a backup per se.
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ZFS with snapshots on the targeted machine is a great mitigation but not a silver bullet. Snapshots can expire or be overwritten by new encrypted data until good data is lost (depending on the configuration). Or the ransomware attack could be block level, which is hitting a lot of people lately. Or the machine could explode :) I think snapshots should be considered as a way to restore point-in-time data locally, not as a backup per se.