Disaster Recovery is the process you follow to get your IT systems back up and running again in the event of a disaster. A disaster may not be a fire, flood or power failure, but could be a major virus outbreak that has crippled your servers.
You may think you’re covered because you have multiple backups. But if those backups are in the same location as your servers, then whatever affects your server may also have affected your backup data too. There is concern among certain backup vendors that it is only a matter of time before the next Cryptowall-type variant of malware also encrypts your backups on a NAS server.
That is why a multi-layer approach to backups is neccesary. Your off-site backups should be separated by what is called an ‘air gap’, meaning there is no direct connection between your on-site environment and your backups off-site, thereby ensuring they are protected from disaster, change or corruption.