Full definition
Common implementations: VMware vSphere snapshot (on VMDK), Hyper-V Production Checkpoints, ZFS snapshot, Btrfs snapshot, AWS EBS snapshot, Azure Disk Snapshot, NetApp SnapShot. Snapshots are fast (seconds) and space-efficient, but depend on the original volume: if the underlying disk fails or is encrypted, snapshots on the same storage fall along. Snapshot is NOT backup. Modern ransomware attackers (BlackCat, LockBit) delete VMware/Hyper-V/VSS snapshots before encrypting. Snapshot helps with accidental-operation rollback and fast granular restore, but must be complemented by immutable offline backup for ransomware protection.
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