NAS is Network Attached Storage. It can store the quick-increased information. Backup means to prepare a spare copy of a file, file system, or other resource for use in the event of failure or loss of the original. This essential precaution is neglected by most new computer users until the first time they experience a disk crash or accidentally delete the only copy of the file they have been working on for the last six months. Ideally the backup copies should be kept at a different site or in a fire safe since, though your hardware may be insured against fire, the data on it is almost certainly neither insured nor easily replaced.
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