Before You Begin

Before you create a replication job, check the following prerequisites:

• Backup infrastructure components that will take part in the replication process must be added to the backup infrastructure and properly configured. These include source and target Microsoft Hyper-V hosts and backup repository for storing replica metadata. If you want to perform backup in the off-host backup mode, the off-host backup proxy must also be added and properly configured.

• The target volume must have enough free space to store disks of replicated VMs. To receive alerts about low space on the target volume, configure global notification settings. For more information, see Specifying Other Notification Settings.

• If you plan to replicate VMs via WAN accelerators, source and target WAN accelerators must be added to the backup infrastructure and properly configured. For more information, see Configuring WAN Accelerators.

• If you plan to replicate VMs via WAN accelerators, it is recommended that you pre-populate the global cache on the target WAN accelerator before you start the replication job. Global cache population helps reduce the amount of traffic transferred over WAN. For more information, see Populating Global Cache.

• If you plan to replicate VMs from the backup, the backup job that you plan to use as the source must be configured beforehand. For more information, see Remote Replica from Backup.
• If you plan to use pre-job and post-job scripts and/or pre-freeze and post-thaw scripts, you must create scripts before you configure the replication job. Veeam Backup & Replication supports script files in the following formats: EXE, BAT, CMD, JS, VBS, WSF, PS1, SH.
• Host and target Hyper-V hosts that you select for the replication process must be compatible. See the tables below to check possible options for source and target Hyper-V hosts and type of created VM replica.

New replication jobs or jobs with no VM replica restore points

Existing replication jobs with VM restore points

Applicable if you upgrade from previous versions of Veeam Backup & Replication and you have legacy jobs that use Microsoft Hyper-V 2008 R2 and higher as a target.

Mind the following limitations:

• [For VMs with VHD disks] If you change the size of VM disks on the source VM, Veeam Backup & Replication will delete all available restore points on the VM replica during the next replication job session.
• Due to Microsoft limitations, you cannot use Microsoft Azure Active Directory credentials to perform application-aware processing on VMs running Microsoft Windows 10.

• You cannot replicate VMs with shared VHDX disks.