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NetVault Plug-in for FileSystem 13.1 - User Guide

About backup types

The NetVault supports the following backup types:

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Full Backup: A Full Backup provides a backup of all selected files and folders. Full Backups take longer to complete and consume more backup media. However, restores are faster since the plug-in is only required to restore a single saveset. Full Backups serve as the base backups for subsequent Incremental and Differential Backups.
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Incremental Backup: An Incremental Backup provides a backup of files that are new or have changed since the last Full or Incremental Backup. Incremental Backups consume minimum storage space and are quicker to perform. However, data recovery can take more time depending on the number of savesets that the plug-in is required to restore.
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Differential Backup: A Differential Backup provides a backup of files that are new or have changed since the last Full Backup. Differential Backups speed up recovery since the plug-in is only required to restore two savesets. However, these backups consume more storage space and take more time to complete than the Incremental Backups. Differential Backups duplicate the data backed up by previous backups of the same type.

About System State Backups

System State Backups back up critical system data, which is essential to recover a functional system in the event of a system failure. These backups are only supported on Windows-based systems. System State data include the following components:

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Registry
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COM+ Class Registration Database
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Boot files, including the system files
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System files that are under Windows File Protection
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Certificate Services Database (on a Certification Services Server)
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Active Directory (on a Domain Controller)
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SYSVOL (on a Domain Controller)
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Cluster Service Information (in a cluster setup)
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IIS Metadirectory (if it is installed)

The Snapshot-Based Backup method is recommended for a consistent backup of the System State data. Regardless of the backup type, certain System State components are always backed up in full. You must include all system state components in a backup or restore job.

 
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NOTE: In a cluster environment, you may require the Disk Signature information during a System State restore if the shared cluster disks are changed after a backup. The Disk Signature information can be obtained using the Windows “dumpcfg.exe” utility. For more information about this tool, consult the relevant Windows documentation.

About multistream backups

The NetVault can be configured to perform multistream operations when you are backing up large amounts of data. Multistream backups improve backup performance by using parallel streams to transfer data.

During multistream backups, the plug-in splits the Backup Selection Set is into smaller selection groups and uses separate child processes to perform parallel backups of these selection groups.

You can use the multistream options to do the following:

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Back up multiple volumes, network shares, and mount points simultaneously
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Back up a single volume using multiple parallel streams

You can specify the maximum number of parallel data streams that the plug-in can use for each job. The plug-in allows up to eight parallel streams.

 
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NOTE: For multistream backups, when using the Use Heuristics option, granularity for selection groups is at the directory level. If you do not select Use Heuristics, granularity is at the volume level.

Backup and recovery strategy

A well-designed backup strategy helps you to recover from the damages caused by failure and resume normal operations as quickly as possible. Before you start backing up your data, ensure that a good strategy is in place that safeguards your data against various failure modes, such as media failure, data corruption, user error, and complete loss of a data center.

Typically, your backup plan should define what backup methods are used, when and at what intervals the backups are performed, how the backups are stored, how long the backups are retained, and how the backup media are re-used.

The following are some example backup sequences to offer you guidelines:

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Full Backups only: You can choose to perform only Full Backups if the backup size is small, backup window is not an issue, or storage media is not a constraint. In such scenarios, you can schedule Full Backups every night or every N hours depending on the frequency of updates.
If a failure occurs, the plug-in is only required to restore a single saveset.
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Full and Incremental Backups: For quicker backups and minimum use of storage media, you can include Full and Incremental Backups in your strategy. For example, you can schedule Full Backups every Sunday and Incremental Backups every day or every N hours depending on the frequency of updates.
If a failure occurs, the plug-in is required to restore data from the recent Full Backup and each Incremental Backup in the backup sequence. The restore might take longer if several Incremental savesets have to be restored. For example, if the failure occurs on Saturday, the plug-in is required to restore the Full Backup taken on Sunday and Incremental Backups taken from Monday through Friday.
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Full and Differential Backups: For quicker restores and reduced media usage, you can include Full and Differential Backups in your strategy. For example, you can schedule Full Backups every Sunday and Differential Backups every day or every N hours depending on the frequency of updates.
If a failure occurs, the plug-in is required to restore data from the recent Full Backup and the last Differential Backup.
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Windows System State Backups: For System State backups on Windows, you can choose either of the following strategies:
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Back up only the System State data
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Back up the C Drive and System State data
Backing up the System State data with C drive has the following advantages:
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It eliminates duplication of the system files in a saveset. If you run two separate jobs, the system files are included in both savesets.
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You can use this backup to perform a disaster recovery.
The snapshot-based method is recommended for a consistent backup of the System State data.
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Policy-based backups: At the enterprise-level, you can create a policy to back up the root directory on Linux and UNIX clients and all fixed drives and System State on Windows clients. For more information about backup policies, see the Quest NetVault Administrator’s Guide.
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