Tape-based protection process, See also, Recovery process – Dell PowerVault DP600 User Manual

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Tape-Based Protection Process

When you use short-term disk-based protection and long-term tape-based protection, DPM can

back up data from the replica volume to tape so that there is no impact on the protected

computer. When you use tape-based protection only, DPM backs up the data directly from the

protected computer to tape.

DPM protects data on tape through a combination of full and incremental backups from either the

protected data source (for short-term protection on tape or for long-term protection on tape when

DPM does not protect the data on disk) or from the DPM replica (for long-term protection on tape

when short-term protection is on disk).

Note

If a file was open when the replica was last synchronized, the backup of that file from the

replica will be in a crash consistent state. A crash consistent state of the file will contain

all data of the file that was persisted to disk at the time of last synchronization. This

applies only to file system backups. Application backups will always be consistent with

the application state.

For specific backup types and schedules, see

See Also

How DPM Works

Recovery Process

The method of data protection, disk-based or tape-based, makes no difference to the recovery

task. You select the recovery point of data that you want to recover, and DPM recovers the data

to the protected computer.

DPM can store a maximum of 64 recovery points for each file member of a protection group. For

application data sources, DPM can store up to 448 express full backups and up to 96 incremental

backups for each express full backup. When storage area limits have been reached and the

retention range for the existing recovery points is not met yet, protection jobs will fail.

Note

To support end-user recovery, the recovery points for files are limited to 64 by Volume

Shadow Copy Service (VSS).

As explained in

, the process for creating recovery points differs between file data and

application data. DPM creates recovery points for file data by taking a shadow copy of the replica