Understanding snapshot backup

The snapshot function creates a quick backup copy of data. It sets up a link between the source and target logical devices; then, it creates a backup of the source data on the target drive. Any changes made to the source drive after you create a snapshot backup are not reflected on the target drive. You can use the backup copy of data for tape backup, drive cloning, and multi-server rollout.

There are two primary snapshot functions: backup and nobackup. The snapshot backup function copies the entire contents of the source drive to the target drive so that entire logical devices can be moved from one server to another. The snapshot nobackup function creates a temporary copy of a drive for tape drive backup and reference purposes. The snapshot nobackup function is less I/O-intensive than the snapshot backup function.

Before using snapshot, consider the following requirements:

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