About snapshots
A snapshot is a point-in-time, read-only, disk-based copy of a client volume. After the snapshot is created, NetBackup backs up data from the snapshot, not directly from the client's primary or original volume. Users and client operations can access the primary data without interruption while data on the snapshot volume is backed up. The contents of the snapshot volume are cataloged as if the backup was produced directly from the primary volume. After the backup is complete, the snapshot-based backup image on storage media is indistinguishable from a traditional, non-snapshot backup image.
All the features of Snapshot Client (including off-host backup, FlashBackup, and Instant Recovery) require the creation of a snapshot.
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