"There two groups of people: those who have already had a storage failure and those who will have one in the future." - Peter Krogh
In short, the 3-2-1 rule of backup means you must;
- Have at least three independent copies of your data.
- Store the copies on two different types of media.
- Keep one backup copy offsite.
Read More: http://dpbestflow.org/node/262
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