Qualities of a Good Backup
Obviously, in the best of all possible worlds, backups would be perfectly reliable, always available, easy to use, and really fast. In the real world, trade-offs must be made. For example, backups stored offsite are good for disaster recovery, but are not always available.
Above all, backups need to be reliable. A reliable backup medium will last for several years, whereas a reliable archive medium should last much longer. Of course, if the backups are never successfully written to the backup medium, it does not matter how good the medium is, and today's ever-increasing storage requirements can tax even the very best hardware and strategies.
Speed is more or less important, depending on the system and use of the data. ...
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