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BACKUP TECH TIPS & TROUBLESHOOTINGBackup ProceduresFull Backup:A Full backup is simply backing up all files on the system. Users may choose to update archive attributes if they plan on doing any of the following 2 types of partial backups. |
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Incremental Backup: An incremental backup is a backup that backs up only the files modified since the last backup. When running an incremental backup, users need to update the archive attribute while backing up only modified files. Often the incremental backups are appended to the full backup set. The result is a tape with the changes that occurred daily. This type of backup is useful if the user wishes to have an audit trail of file usage activity on their system and will enable them to restore a specific days work without restoring any changes made since that point in time. To do a full restore for 4 days after a full backup they must restore the full backup and all 4 data sets after it. Unlike the next type of backup. Differential Backup: A differential backup is a cumulative backup of changes made since the last full backup. It backs up modified files only but does not update the archive attribute. The list of files grows each day until the next full backup is performed clearing the archive attributes. This enables the user to restore all files changed since the last full backup in one pass. These backups can be appended to the full as well, but they will have to keep in mind that each set can contain a different version of a file if that file changes daily. The data sets will always be at least as big as the previous differential (if no changes were made) and will continue to grow as files change. Once a files archive attribute is set it will be backed up each day until after the full backup resets it's attribute bit. |
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