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NetVault Plug-in for Exchange 12.0 - User Guide

Introducing NetVault Backup Plug-in for Exchange Defining an Exchange data protection strategy Planning your Exchange Server deployment Installing and removing the plug-in Configuring the plug-in Backing up data Restoring data Troubleshooting

Restoring data

Restore and recovery overview

When preparing to restore an existing backup, several key concepts are useful to understand. The following topics explore these concepts.

The Restore Method is the technology that is selected to perform the restore. The Plug‑in for Exchange supports several Restore Methods, each with its own specific purpose.

ESE is the native technology used to perform restore and recovery operations for Exchange Server. ESE is provided from Microsoft as a standard Exchange Server component in Exchange 2007.

When using the ESE Restore Method, all databases being restored must first be dismounted using a Microsoft-approved approach or by selecting the Dismount Databases Before Restore option in the Restore and Recovery Options tab of the Restore Options tab. Failing to dismount the database before performing the restore results in either a Restore Failure or a Restore Completed with Warnings job status.

IMPORTANT: Windows Server 2008 supports Exchange Server 2007 SP1 or later; previous versions of Exchange 2007 are not supported. In a standard Exchange Server 2007 SP1 installation, there is an ESE client library (esebcli2.dll) in the Exchange Server Bin folder. The file version of esebcli2.dll is for Exchange Server 2007 SP1. However, if this library is not replicated from the Exchange Bin folder to the Windows Bin folder, an older version of the .dll file might be present in the Windows Bin folder. Plug‑in for Exchange uses the ESE client library that is available in the Windows Bin folder. If the older version of the library is contained in the Windows Bin folder, a backup or restore job might fail. If a failure occurs, save a copy of the ESE client library from the Windows Bin folder to a safe location, copy the ESE client library from the Exchange Server Bin folder to the Windows Bin folder, and run the backup or restore job again.

During a VSS-based restore, the plug-in instructs the Exchange Store Writer to coordinate with the Exchange Information Store — on behalf of the plug-in — to prepare the system for the restore, verify the restore targets, put back the data from the backup device, and then replay the transaction logs as needed.

Plug‑in for Exchange lets you restore the raw files from storage to a specific target directory. This method provides greater freedom in restoring database files, particularly when restoring files for nontraditional purposes, such as data mining or compliance auditing.

The Copy Files Restore Method does not require that you dismount databases from the Exchange Server. However, Database Recovery is not supported when using this restore method.

Reviewing the Phases of the Restore Sequence

Each Exchange Server restore scenario has two distinct phases: the Restore Phase and the Recovery Phase.

The Restore Phase is used to transfer all the files included in a backup from storage to the local disk. This process can be done using one of the Restore Methods defined in Reviewing the available restore methods.

When performing restore sequences that include Incremental or Differential Backups, the Restore Phase is performed for each backup that is restored.

Ensure that adequate disk space is available on the volume or volumes where the databases are stored during a restore. If disk space is exhausted during the Restore Phase, the restore job fails.

In the Recovery Phase, changes that were logged in the transaction log files are reapplied to the corresponding databases to bring the Exchange Server forward in time. This phase is only available when using the ESE or VSS Restore Method.

When restoring sequences of backups (if there are Incremental or Differential Backups),  the Recovery Phase is performed one time as the final step in the restore sequence. Recovery is only performed once, regardless of the number of backups included in the restore sequence.

Restoring data using the plug-in

A standard restore procedure includes the steps outlined in the following topics:

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