In the event of a disaster, the data on backup media will not be sufficient to recover. Computer systems onto which the data can be restored and properly configured networks are necessary too. Some organizations have their own data recovery centres that are equipped for this scenario. Other organizations contract this out to a third-party recovery centre. Note that because Disaster Recovery site is itself a huge investment, backup is very rarely considered preferred method of moving data to Disaster Recovery site. More typical way would be remote disk mirroring, which keeps the Disaster Recovery data as up-to-date as possible.