Backup Chain and Retention Policy
This section covers information on how Veeam Backup & Replication stores backups exported by K10 policies and how Veeam Backup & Replication applies backup retention policy to these backups.
Veeam Backup & Replication keeps backups exported by K10 policies in Veeam backup repositories in the following backup files.
- VBK — full backup files that store copies of full VM images.
- VBM — backup metadata files that store information about the policy, applications processed by this policy, a number and a structure of backup files, restore points, and so on.
Backup files reside in a dedicated job folder in the backup repository. A set of backup files form a backup chain. For more information, see the Backup Chain section in the Veeam Backup & Replication User Guide.
To create and keep backup chains in backup repositories, Veeam Backup & Replication uses different backup methods. To keep data exported from K10, Veeam Backup & Replication uses the synthetic full backup method and implements it the following way.
When K10 exports application disks to backup repositories for the first time, a Veeam Data Mover creates a VBK file. When a K10 policy starts again, the Veeam Data Mover creates a temporary incremental backup file (VIB). This temporary VIB keeps incremental changes of K10 backup exports and Veeam Data Mover uses this VIB to create a new VBK file. Once a new full backup file is created and the K10 policy session finishes, the temporary incremental backup is removed from the Veeam backup repository. Therefore, a backup chain of data exported from K10 consists of VBK and VBM backup files.
To store and manage backups exported by a K10 policy, Veeam Backup & Replication applies retention policy that you have specified in the K10 policy settings. For more information, see Kasten Docs.