While snapshots do not replace backups, they provide a quick and convenient method for accessing files from a specific point in time. Restoring data from a snapshot is quicker than restoring from a backup or waiting for a system administrator to restore a backup for you. Need to test some configuration changes but don’t want to permanently muck up the system? Or perhaps you’re preparing for an operating system upgrade and want a quick way to revert to the pre-upgrade version should things go terribly wrong. Perhaps you’re considering updating an application but fear the pain of clobbered libraries. Need a copy of that file you deleted last Tuesday? No problem. Imagine taking a snapshot of your home directory at the beginning of the work day, and perhaps another one after lunch. This is a powerful feature as there are many scenarios where it is convenient to access files from a certain point in time. What exactly is a snapshot? zfs(8) defines it as a “ Read-only version of a file system … at a given point in time”. Since snapshots are atomic, they are not affected by other processes and you don’t have to stop any running applications before taking a snapshot. Snapshots complement a backup strategy, as they are instantaneous and don’t require a backup window. OpenZFS stands out in its snapshot design, providing powerful and easy-to-use tools for managing snapshots.
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