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A snapshot backup is a type of backup copy used to create the entire architectural instance/copy of an application, disk or system. It is used in backup processes to restore the system or disk of a particular device at a specific time.
A snapshot backup can also be referred to as image backup.
Snapshot backups are primarily used to restore a system, virtual machine and disk or drive to an operational state and to serve as the system’s restore point when the snapshot was taken. It is not equivalent to a backup copy and it doesn't store the data itself but just defines where and how the data was stored and organized. Typically, the snapshot is created using disk/system imaging or system restoration and recovery software. However, most backup software can also take snapshot backups and restore the system using the snapshots.