This is a backup procedure that should be followed by all sysadmins. The idea behind it is that even if your backup is done but your office burns down the next day, you are still screwed (but not in a good way).

An offsite backup is taking that information away from the location. So if it's in the form of a physical media you'd take that media (be it tape or cd) home with you at night.

If your backups are in the form of a zip or tarball you would store this on another server that is not residing in the office.

While taking a backup home with you does indeed protect your data from a fire at the office, I think it doesn't go quite far enough.

What if whatever destroys the site also destroys your house? An earthquake of sufficient magnitude could level an entire city, including your home. A tornado could cut a swath of destruction for miles, demolishing both your house and the office. Let's not even think about weapons of mass destruction...

To be absolutely safe, I'd insist on keeping a backup in a secure facility no less than 300 miles away. Preferably in a fireproof safe.

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