Disk-Based Backup Appliances Go Head-to-Head

Any IT pro who has designed a backup scheme knows that backup is complicated. You need to consider issues such as incremental versus differential backup, retention periods, backup windows, and point-in-time recovery, among many others. Of course, backup involves not just copying data but also restoring it, and restoring from tape can be difficult and error-prone. Backup ought to be simpler, especially for small-to-midsized businesses (SMBs) that have limited IT resources.

In the wake of Microsoft's recent release of Windows Storage Server and the advent of Serial ATA (SATA) disks, I anticipated seeing disk-based backup innovations to simplify backup and restore and finding good deals on backup appliances for SMBs. I found four backup-appliance solutions that include all the hardware and software necessary to back up Windows servers to disk. (For a list of additional vendors of backup-appliance products, see the sidebar "More Backup-Appliance Vendors.") Each vendor also offers optional tape backup or replication for offsite storage, open-file support, and agents to enable backup of Microsoft Exchange Server and Microsoft SQL Server data.

Each solution takes a different approach to backup. When developing ratings, I considered each product's ease of use, functionality, price, and expandability. Table 1 provides a detailed comparison of the products' features. I gave the solution that had the best balance of these factors the Editors' Choice award, but the products that received lower ratings might also be good choices for you if low-cost offsite backup is a priority or if you can trade off functionality for simplicity.

InteliNAS
Tandberg Data's InteliNAS appliance is a 1U (1.75") rack-mountable device that runs Windows Storage Server. You can control the appliance's file-sharing functionality through a Web-based interface, but the backup functionality requires you to access the Windows GUI. For those who haven't used Windows Storage Server, it operates like any other version of Windows but has behind-the-scenes optimizations for storage. InteliNAS is sold with VERITAS Software's VERITAS Backup Exec as an add-on, which you can use to manage disk-to-disk backups and restores and migrate backups to tape if you purchase an optional tape drive or autoloader. Given VERITAS's large market share, many readers might already be familiar with its products' rich functionality, ease of use, and support for both disk- and tape-based backups. The familiarity of both Windows Storage Server and Backup Exec make InteliNAS a compelling solution. However, Tandberg Data has done little in the way of enhancing the combo to simplify backup.

Before I could back up data to the InteliNAS appliance, I had to configure Backup Exec's storage parameters. Tandberg Data provides only minimal support for Backup Exec, so I decided to dive into the manual myself. I learned that backing up to disk requires creating an aptly named Backup-To-Disk folder by simply selecting a location on the hard drive. Backup Exec treats Backup-To-Disk folders as devices (as it does tape drives). I created multiple Backup-To-Disk folders and put them in a device pool, to let backup jobs run in parallel, as Figure 1 shows. I also organized storage into media sets (i.e., a group of media that share a retention period). Although Backup Exec is generally easy to use for an enterprise-class backup solution, I felt a bit overwhelmed by the amount of documentation I had to read before performing my first backup.

Next, I pushed agents to the machines I wanted to back up, selected a backup schedule policy, and performed both a backup and a restore of about 150GB of data. Backup Exec installed agents from the InteliNAS console. For my backup scheme, I chose from three VERITAS-designed backup policies—Daily Full, Weekly Full and Daily, or Monthly Full with Weekly and Daily—that determined how much historical data I could recover. Because I was backing up to disk, Backup Exec let me choose synthetic backups, which save bandwidth by building a full backup from previous full and incremental backups. In addition to backing up files, Backup Exec supports backups of the registry, system state, and Active Directory (AD). Restoring data was also straightforward; Backup Exec located all the appropriate disk backups to restore without user intervention.

Backup Exec provides standard alerting and reporting capabilities. Reports helped me identify failed jobs and skipped files. Although I didn't obtain the optional tape drive with the InteliNAS appliance, Backup Exec includes reports to determine which tapes should move between the library and vault.

Tandberg Data does little preconfiguration of InteliNAS, but Backup Exec's ease of use and functionality complement the appliance, and the two products make a good combo. However, I found the bundled solution offered nothing to simplify backup beyond its individual components.

Exabyte E-Z D2D2T
Exabyte, Snap Appliance, and BakBone Software have bundled an Exabyte tape library, a Snap Appliance NAS device, and BakBone's NetVault backup software into two 1U (1.75") devices sold as a single backup-appliance bundle, called the Exabyte E-Z D2D2T (for "disk-to-disk-to-tape"). The Snap Appliance device runs BakBone's NetVault 7 for Guardian OS, a Linux derivative, but you manage the appliance through a Web-based UI. The Snap Appliance product comes with NetVault 7 installed and preconfigured with 500GB of disk space dedicated to a virtual tape library (VTL). NetVault is licensed by capacity for VTL support, though, so you'll have to purchase additional licensing from BakBone to fully use the available disk space for backup. Inclusion of tape as a standard feature makes E-Z D2D2T a great value if offsite storage is a requirement, but NetVault's VTL licensing limit and limited backup automation made backing up somewhat complicated.

Although NetVault is installed on the Snap Appliance device, I had to install a second copy of NetVault on my own machine to manage the instance on the Snap Appliance device. Like Backup Exec, NetVault requires you to install a client on each machine that will be backed up. NetVault doesn't perform remote installations, but it does come as a Windows Installer (.msi) package, so you can distribute it through Group Policy. Defining NetVault backup jobs is similar to doing so by using Backup Exec, and NetVault lets you back up client machines' file systems as well as the registry, system state, and AD.

Unlike using Backup Exec's backup policies, creating a backup scheme via NetVault is a manual process. In addition to letting you choose the type and schedule for each backup job, NetVault supports a feature called duplication, which the dialog box in Figure 2 shows. This is where the D2D2T part comes in. BakBone and Exabyte technical support walked me through their recommended configuration, which used duplication to create a disk-based backup on the VTL and roll it to tape.

BakBone and Exabyte tech support worked well together to get my solution working. E-Z D2D2T hadn't yet been officially released at the time of testing, so my experience might not be representative. However, Exabyte plans to provide first-level support for the entire bundle and work directly with both BakBone and SnapAppliance for second-level support.

Like Backup Exec, NetVault also includes alerts and reporting to monitor backups. I successfully configured SMTP email alerts; however, all alerts go to a single email address, and you can't alert different people for different backup jobs. NetVault's restore process is also similar to Backup Exec's and required no user intervention as long as the necessary backup tapes were in the library.

E-Z D2D2T is the only bundle I reviewed that includes everything necessary for offsite backup without requiring an additional purchase. Additionally, considering Exabyte's plan to provide well-organized support and a competitive price, E-Z D2D2T is a compelling choice. NetVault's manual backup-planning process and a licensing scheme that prevents me from fully using my available disk space for backup are too significant to ignore, however. I recommend E-Z D2D2T only if your priority is moving tapes off site over the speed and simplicity of disk-based backups.

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