How to avoid typical misconfigurations when setting up Veeam

This article is aimed at giving you a smooth start with Veeam Backup & Replication. It includes some basic advice on the initial setup, and outlines the most common misconfigurations that we, at Veeam Support, find in clients’ infrastructures during our investigations.

Recommendations on Veeam backup modes

In most cases, forward incremental or forever forward incremental backup modes are recommended as the fastest ones. Forever forward incremental (no periodic full backup) requires less space and offers decent performance. Forward incremental requires more space, but is also more robust (because a backup chain is further divided in subchains by periodic full backup).

Reverse incremental backup method is our oldest backup method and consequently the slowest. Depending on the type of storage in use, it can be three or more times slower than other modes. With the reverse incremental backup, you get a full backup as the last point in the chain. This allows for faster restores in case the most recent point is used, but the difference is often negligible in comparison to a forward incremental chain (if its length is not unreasonably long, we usually suggest it to be around 30 days).

Insights on the full backup

Synthetic full operation builds a full backup file from the restore points already residing in your repository. However, not every storage type provides a good performance with synthetic operations, so we advise to use active full backup as an alternative.

When you set up a synthetic full backup mode, there is an additional “Transform previous backup chains into rollbacks” option available. Keep in mind though that this option starts a task of transforming incremental backups (.VIB) into rollbacks (.VRB), which is very laborious for your target backup repository. For example, it will help you transform your current chain into the reverse incremental one for archival purposes. However, if you use it as a main backup method, it would produce a very specific backup chain consisting of a full backup file and a mix of forward and reverse incremental restore points.

Veeam - A forward incremental backup job with periodic synthetic full

Figure 1. A forward incremental backup job with periodic synthetic full.

Guest processing tips

Guest processing is used to create consistent backups of your VMs. And if they run instances of Microsoft Exchange, Active Directory, SharePoint, SQL Server and Oracle applications, you will be able to leverage granular restores using Veeam Explorers. Please note that guest processing relies on a VSS framework (a Windows feature), which should be functioning correctly, otherwise your backup jobs will fail.

To enable guest processing, go to Guest Processing of backup job properties. You should enable “Application-aware processing” option and you should provide an administrative account under guest OS credentials.

Figure 2. Guest processing step controls application-aware processing and indexing.

If some of VMs in the job require specific credentials, you can set them by clicking on the “Credentials” button. This brings up the Credentials menu. Click on “Set User…” to specify the credentials that should be used with the VM.

Veeam - Credentials menu

Figure 3. Credentials menu allows to set up users for each VM in the job.

Clicking on the “Applications…” button brings up a menu where you can specify options for supported applications and disable the guest processing for certain VMs, if needed.

Veeam - guest processing

Figure 4. In Applications menu, you can specify options for various application or disable guest processing completely for a VM.

VM guest file system indexing

With “VM Guest File System Indexing” enabled, Veeam Backup & Replication creates a catalog of files inside the VM, allowing you to use guest file search and perform 1-click restores through our Veeam Backup Enterprise Manager.

In case you don’t use the Enterprise Manager, then you can cut some (sometimes significant) time off your backup window and save space on the C: drive of a Veeam server by disabling this option. It doesn’t affect your ability to perform file level restores from your Veeam Backup & Replication console.

Secondary backup destination

No storage vendor can guarantee an absolute data integrity. Veeam checks a backup file once it’s written to a disk, but, with millions of operations happening on the datastore, occasional bits may get swapped causing silent corruption. Veeam Backup & Replication provides features like SureBackup and health checks that help detect an early corruption. However, sometimes it may be already too late, so it’s absolutely necessary to follow the 3-2-1 rule and use different sets of media in several locations to guarantee data Availability.

To maintain the 3-2-1 rule, right after creating a primary backup job, it’s advised to set up a secondary copy job. This can be a Backup Copy Job to a secondary storage, Backup Copy Job to a cloud repository or a copy to tape.

Instant VM recovery as it should be

Instant VM Recovery allows you to start a VM in minimal time right from a backup file. However, you need to keep in mind that a recovered VM still sits in your backup repository and consumes its resources. To finalize the restore process, the VM must be migrated back to the production. Too often we at Veeam Support see critical VMs working for weeks in the Instant VM Recovery mode until a datastore fills up and data is lost.

For those of you looking for a deep dive on the topic, I recommend the recent blog post on Instant VM Recovery by Veeam Vanguard Didier Van Hoye.

Veeam - VM Recovery mode

Figure 5. Soon after VM is started in the Instant VM Recovery mode you should initiate its migration back to the production.

Mind the CIFS as a main target repository

Veeam is storage agnostic and supports several types of backup repositories. Over the years, it was proven that a Windows or Linux physical server with internal storage gives the best performance in most cases.

Backup repository on a CIFS share still remains a popular choice, yet it generally offers the poorest performance of all options. Many modern NAS devices support iSCSI, so a better choice would be to create an iSCSI disk and present it to a Veeam server/proxy. Note though, that it’s also not recommended to use reverse incremental backup mode for repositories on NAS because it puts heavy IO load on the target.

Target proxy for replication

When replicating over the WAN, it is advised to deploy a backup proxy on the target site and configure it as a target proxy in replication job settings. This will create a robust channel between the two sites. We recommend setting a target proxy to NBD/Network mode, as using hot-add for replica can cause stuck and orphaned snapshots.

Note that when using WAN accelerators, a target proxy should still be deployed. Target WAN accelerator and target proxy can be installed on different or on a single machine, given it has enough resources.

Veeam - For replication over WAN, you should specify source and target proxy

Figure 6. For replication over WAN, you should specify source and target proxy.

Veeam - Set the target proxy mode to Network.

Figure 7. Set the target proxy mode to Network.


A must-do for a tape server

Tape server is a component responsible for communication with a tape device. It is installed on a physical machine to which a tape device is connected (“pass through” connections via ESXi host to a virtual machine are not supported!).

Veeam Backup & Replication gets the information about the library from the OS, so you should make sure that the latest drivers are installed and the tape device is visible correctly in the device manager.

You can find more info on using tapes with Veeam Backup & Replication in the previous blog post.

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