Computer Associates BABWBN2900NE2 Option Guide - Page 18

Database Backup Strategies, Full Daily Backup, Full with Incremental

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Backing Up The actual files backed up depend on the type of backup option that you have selected. The Directory and Information Store files are located in the following subdirectories of the Microsoft Exchange Server home directory: \MDBDATA \DSADATA The Backup Agent Brick Level option allows you to back up individual mailboxes and folders. You should be aware that performance is slower when backing up or restoring individual objects compared to database backups (directory and information store backups). The following limitations apply when backing up and restoring mailboxes: ■ The BrightStor ARCserve Backup browser does not display newly created empty mailboxes. ■ The backup of a mailbox that has been exported to a PST file reports its status as successful. Database Backup Strategies Each server must have its directory backed up separately. At least one server in a site should be kept up-to-date, depending on how often changes are made to the directory in the site. If a site is constantly changing (new servers, new users, new distribution lists), a backup should be performed on the directory regularly (weekly, for example). If the directory is less dynamic, the directory could be backed up less frequently (monthly, for example). It is essential to have a backup of the directory on each server because there is server-specific information in each directory. If a server experiences media failure, the backed up directory for that server must be restored. Changes that have occurred since the directory was backed up are replicated from the other servers online (unless you have only one server, in which case the only changes that can be restored are what the restore provides). The up-to-date backup is kept current in case all servers fail. ■ Full Daily Backup-With this method, a full backup is performed every day. The advantage of a full daily backup is that if there is a catastrophic system failure on Thursday, only one media group is required to perform a full restore of the system. The disadvantage of this strategy compared to other methods is that the backup can take a great deal of time each day. ■ Full with Incremental-In this strategy, a full backup is performed each Friday. On Monday, everything that has changed since Friday is backed up. On Tuesday, everything that has changed since Monday is backed up, and so on. The advantage of this method is that the daily backup time is minimized. The disadvantage is that if there is a catastrophic system failure on Thursday, more time and more media are needed to perform a full restore of the system compared with the Full Daily Backup method. 2-8 Backup Agent for Microsof t Exchange Server Option Guide

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Backing Up
The actual files backed up depend on the type of backup option that you have
selected.
The Directory and Information Store files are located in the following
subdirectories of the Microsoft Exchange Server home directory:
\MDBDATA
\DSADATA
The Backup Agent Brick Level option allows you to back up individual
mailboxes and folders.
You should be aware that performance is slower when
backing up or restoring individual objects compared to database backups
(directory and information store backups).
The following limitations apply
when backing up and restoring mailboxes:
The BrightStor ARCserve Backup browser does not display newly created
empty mailboxes.
■
■
■
■
The backup of a mailbox that has been exported to a PST file reports its
status as successful.
Database Backup Strategies
Each server must have its directory backed up separately. At least one server in a
site should be kept up-to-date, depending on how often changes are made to the
directory in the site. If a site is constantly changing (new servers, new users, new
distribution lists), a backup should be performed on the directory regularly
(weekly, for example). If the directory is less dynamic, the directory could be
backed up less frequently (monthly, for example).
It is essential to have a backup of the directory on each server because there is
server-specific information in each directory.
If a server experiences media
failure, the backed up directory for that server must be restored.
Changes that
have occurred since the directory was backed up are replicated from the other
servers online (unless you have only one server, in which case the only changes
that can be restored are what the restore provides). The up-to-date backup is
kept current in case all servers fail.
Full Daily Backup
—With this method, a full backup is performed every
day.
The advantage of a full daily backup is that if there is a catastrophic
system failure on Thursday, only one media group is required to perform a
full restore of the system.
The disadvantage of this strategy compared to
other methods is that the backup can take a great deal of time each day.
Full with Incremental
—In this strategy, a full backup is performed each
Friday.
On Monday, everything that has changed since Friday is backed up.
On Tuesday, everything that has changed since Monday is backed up, and
so on.
The advantage of this method is that the daily backup time is
minimized.
The disadvantage is that if there is a catastrophic system failure
on Thursday, more time and more media are needed to perform a full
restore of the system compared with the Full Daily Backup method.
2–8
Backup Agent for Microsof t Exchange Server Option Guide