Although it is important to consider all of these factors, for Document Level backups, the two most important factors are typically tape usage and the amount of time available for your backups. The following recommendations are based on these two factors. If other factors are more important in your environment, adjust your backup strategy accordingly.
The first task you must perform when determining a backup strategy is to assess the amount of time your organization has available each week for backing up your Exchange Server. Next, perform a backup of your Exchange Server using Document Level backup to ascertain how long the backup job will take. Finally, use this information to determine the most efficient way of backing up your Exchange Server within the time available to you.
If your organization’s backup schedule allows you to perform a full backup at least one day a week, perform daily differential backups with one full backup a week.
If you want to distribute the full backup throughout the week, perform a full backup of only one storage group per day and rotate which storage group gets the full backup. Back up all other storage groups using differential backups.
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