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Software installation overview 5-5
Backups
Backups are a vital link in the data integrity of any system. While you may
never have a need for backups, nothing can replace them in the event of a
major system failure.
You should always perform a backup on your current system before starting
any of these procedures.
To perform a backup, refer to the NAC 2 System Administration and
Maintenance Guide (NTP 553-4011-510), "Maintenance and administration
programs" chapter, "Maintenance and administration programs — system
shut down" section, "Backup and Restore Utilities" section.
Data is backed up automatically at midnight. In the event of a failure where
data is lost, the backup can return all data up to the point when the backup
was taken. Any data lost between when the backup was taken and when the
failure occurs can sometimes be recovered (depending on the nature of the
failure). Ensure that a backup tape is in the NAC tape drive for the
midnight backup.
Additional backups, once per week and once per month, are recommended.
Each backup copies the most current information from the NAC database to
a cassette tape. Any information on the tape prior to the backup procedure
is erased before the current information is copied. You may choose to
recycle your backup tapes to reduce the number of tapes required. A
minimum of three backup tapes is recommended. You should not use the
same tape for two consecutive backups as a failure during the procedure
would cause you to lose the tape's original information as well as the
current information.
Network Administration Center (NAC) Installation Guide Product release 2
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