Disk-based protection and recovery, Tape-based backup and archive, See also – Dell PowerVault DP600 User Manual
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Disk-Based Protection and Recovery
One advantage of disk-based data protection is the potential time savings. Disk-based data
protection requires none of the preparation time that tape-based protection does—locating the
specific tape required for a job, loading the tape, positioning the tape to the correct starting point.
The ease of using a disk encourages sending incremental data more frequently, which reduces
the impact on the computer being protected and on network resources.
Data recovery with disk-based data protection is more reliable than that of tape-based systems.
Disk drives typically have a much greater mean time between failure (MTBF) rating than tapes.
Recovery of data from disk is quicker and easier than recovery from tape. Recovering data from
disk is a simple matter of browsing through previous versions of the data on the DPM server and
copying selected versions directly to the protected computer. A typical file recovery from tape
takes hours and can be costly, and administrators in a medium-size data center can usually
expect to perform 10 to 20 or more of these recoveries each month.
Using DPM and disk-based data protection, data can be synchronized as frequently as every 15
minutes and maintained as long as 448 days.
Tape-Based Backup and Archive
Magnetic tape and similar storage media offer an inexpensive and portable form of data
protection that is particularly useful for long-term storage.
In DPM, you can back up data from a computer directly to tape (D2T). You can also back up data
from the disk-based replica (D2D2T). The advantage of creating your long-term backup on tape
from the disk-based replica is that the backup operation can occur at any time with no impact on
the computer being protected.
Additionally, a thorough disaster recovery plan includes offsite storage of critical information—you
want to be able to recover your organization's data, should your facility be damaged or destroyed.
Tape is a popular and convenient medium for offsite storage.
Using DPM, data can be backed up to tape as frequently as daily for short-term protection, and it
can be maintained as long as 99 years for long-term protection.
By using software solutions from DPM partners, you can use removable media such as a USB
hard drive in place of tape. For more information, see
(http://go.microsoft.com/fwlink/?LinkId=98869).
See Also
Protection for Clustered Servers