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Over a period of time, you need to use several separate discs or tapes when you run your backup regimen. By using multiple discs or tapes instead of repeatedly using the same disc or tape, you gain additional benefits with your backup program:
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It preserves access to multiple versions of data files in case a user needs to restore an older copy of a data file. If the last backup is unsuccessful as a result of a bad cartridge, you have a backup from the previous process. You extend the useful life span of each cartridge.
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Have several extra, new, blank, formatted media available in case of media failure. Regularly scan the Backup log for errors that might indicate that a backup cartridge is beginning to fail. Make sure to clean a tape drive s recording heads regularly. Failure to do so can lead to unusable backups and the premature failure of the tape drive. See the tape drive manufacturer s recommendations for the proper method and frequency of cleaning.
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You need to choose a backup medium to use. If the quantity of data that you need to back up is small, a removable hard disk or rewritable DVD disc (DVD RAM) might be all that you need. However, for more flexibility and capacity for growth, a tape cartridge is still the backup medium of choice. To back up to a CD-R or CD-RW, you must back up to a file first and then copy that file to the CD-R or CD-RW. You can then restore the file directly from the CD-R or CD-RW. Because space on CD-R or CD-RW is limited from 650 to 700 MBs, you might have to divide your backups into smaller jobs. After your storage device is installed, decide on a backup schedule and the type of backup. If the data that is created on a daily basis is irreplaceable, daily backups are necessary. If the data is less valuable, the frequency of backups can be less often. Recognize, however, that the longer the period between backups, the greater the potential for loss. Just as it is unwise to work on a document all day without periodically saving the file, it is unwise to work on a document all week without backing it up. The value of the data helps you determine the appropriate frequency of backups. The type of backup you make determines how easy or difficult it is to restore the data in an emergency. The compromise is between security and convenience. If you choose to run full, normal backups every day, you can restore lost data easily, but the backups can take a substantial amount of time (depending upon the quantity of data to be backed up and the data transfer speed of the storage device). If you choose to make incremental backups for a month
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after making a full backup, you save substantial time in the backup process. However, fully restoring a corrupted hard disk might require you to restore the normal backup and then each incremental backup in succession. Substituting a differential backup for the incremental backup shortens the restore process, but as the backup process takes more time each day, the total accumulation of changed files continues to grow, so the time you gain by using a differential backup might be minimal. You must also use a separate cartridge for each differential backup to prevent losing the ability to retrieve earlier versions of files.
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Computers that contain frequently changing data that is hard to replace or reproduce or computers that provide a public network share need to be backed up daily. Run a full, normal backup every Friday. Every Monday through Thursday run a differential backup to a different tape or disc. After the second Friday, when a second full backup has been successfully made, store the first full backup as a temporary archive. Then after every following Friday s full backup, alternate the full backups as temporary archives. On every eighth Friday, save the full backup as a permanent archive, which needs to be stored in a secure, off-site location. Over the course of a year, this method uses at least 14 tapes or discs. Note
If a computer is used seven days a week, add a Saturday and Sunday differential backup to the schedule. Use new tapes if you choose to make permanent archives on tape.
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