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Restoring microsoft exchange databases – HP Data Protector Express Basic-Software User Manual

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CAUTION:

These .log files are then purged.

When the Backup mode is set to Differential, for databases, only the .log files are included in the

backup job, but these files are not purged.
When the Backup mode is set to Copy, Data Protector Express runs the job similar to full backup.

However, the transaction logs are not purged at then of a job run in Copy mode.

Backup modes and circular logging

Microsoft Exchange Server supports database circular logging. Circular transaction logs differ from

normal logs in that only a few log files are maintained. These files are purged automatically as new log

files are created. When the transactions in the circular log files are recorded in the database, the log files

are then deleted. New transactions are recorded in newly created log files.
If circular logging is enabled, you cannot do incremental or differential backups. These backup modes

rely upon past transaction logs and thus are not available when circular logging in enabled. When

circular logging in enabled, Data Protector Express will revert to full backup mode.
You can check to see if circular logging in enabled for a particular server by examining the Advanced

tab of that server’s Properties window. If you turn circular logging off, Microsoft Exchange Server will

stop the database service and restart it after making the changes.

Restoring Microsoft Exchange Databases

To restore the Microsoft Exchange Server databases, you must restore the database files and all of the log

files created since the last full backup job. To do so, you either (1) restore the databases from the last

full backup if the last backup (the previous day’s) was a full backup; (2) restore the databases from the

most recent full backup and the last differential backup if the last backup was a differential backup; or

(3) restore the databases from the last full backup and all of the incremental backups made between

that day and the present day.
To restore a Microsoft Exchange server, see

Disaster Recovery with Microsoft Exchange Server

.

NOTE:

When you restore the databases, you must create and run a separate job for each set of transaction logs

you need to restore. You cannot skip any logs and the logs must be restored in sequential order. Thus,

when recreating the databases, you must first restore the actual databases (created by a backup job

running in

full

backup mode). Next, you must restore the transaction logs in the order created

and

in

separate jobs. No log can be skipped when restoring.

For example, if you did a full backup on Monday and incremental backups each day Tuesday through

Friday, in order to restore the databases to their state at the close of business Friday, you must run

five separate jobs: one restoring the actual databases from Monday’s full backup job and then four

additional separate jobs restoring each transaction log in sequential order, beginning Tuesday and

continuing with each log sequentially until Friday.

To restore the Microsoft Exchange Server Databases
1.

Find the date of the last full backup of the databases.

2.

Create a restore job.

3.

On the Selection property page, locate and select the Microsoft Exchange Server storage group.

4.

In the Versions of window, click the Details button.

User’s Guide

61

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