Tape
backup can provide for the long-term archival needs of the virtual servers;
however tape cannot provide the level of recoverability required for critical
business applications. Disaster Recovery Planning
requires more.


Rebuilding one application from tape can be a difficult and
lengthy process. Recovering four or more applications at the same time from tape
to rebuild one physical server will result in an excessive period of downtime,
likely more than the business can afford.


Organizations may not understand how vulnerable their data and
business remain to disaster – even after they’ve made a huge up-front and
ongoing investment in tape-based disaster recovery. An article in SearchSecurity reports that in
a survey of 500 IT departments, as many as 20% of routine nightly backups fail
to capture all data. Among participants of another survey cited in this article,
40% of IT managers were unable to recover data from a tape when they needed it.
This is a significant concern for corporations that are regulated as they can
face the risk of being out of compliance if they cannot produce required data
when they need it.


Tape backup also places limits on your recovery point objective (RPO),
the point in time to which you can recover your systems should disaster
strike. Periodic tape backup guarantees hours of lost data in the event of a
disaster. Suppose, for example, that a critical system fails anytime today; the
best you can do is recover to yesterday’s data, which will be at least twelve
hours old. The later in the day disaster strikes, the older the data from which
you’ll recover. In addition, recovering from a disaster, any data not backed up
is lost for good – unless you recreate it.

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