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For on-premises backup solutions, we recommend rotating a set of backups off-site once a week. Ideally, you should store your backups in a secure location, such as a safe deposit box. Another method is to follow the “2x2x2” rule: two sets of backups held by two people at two different locations.
Especially if your area is susceptible to natural disasters, think about going a step further. You need to make sure your local and remote backup solutions won’t be hit by the same disaster that damages your office.
For example, in the wake of Hurricane Ike, one organization we spoke with had displaced staff working remotely in four different cities. One staff person reminded us that if you’re storing your backups in the same city as your office computers, there’s a danger that one catastrophe will destroy both: “Consider your entire city a potential point of failure!” Similarly, when TechSoup relocated our datacenter in 2011, we made sure to select a site that was located in a different earthquake zone from our main offices.
Although it may sound overly cautious, you will be glad to have a system like this in place should disaster strike.
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