The 3-2-1 backup rule ensures that there are multiple copies of data stored on different media and with at least one copy off-site to prevent total data loss in case of a disaster. Having three copies of data helps in protecting against accidental deletion or corruption. Two different media ensure that hardware failure on one type of media doesn't result in complete data loss. One copy off-site is for recovery in case of a location-specific disaster (like a fire or flood) that could destroy on-site backups.
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What are the specific components of the 3-2-1 backup rule?
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Why is it important to have an off-site copy of data?
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What types of media can be used for the two different media types in the 3-2-1 rule?