9/15/2023 0 Comments Veeam data domainThe source-side Veeam Data Mover consolidates this information with CBT information from the hypervisor and filters VM disk data based on it. Before the source-side Veeam Data Mover starts processing a VM disk, it obtains digests for the previous restore point in the backup chain from Veeam Data Mover in the target side. Veeam Data Mover in the source side deduplicates VM data at the level of VM disks.Veeam Backup & Replication uses Veeam Data Movers to deduplicate VM data: However, note that data deduplication may decrease job performance. We recommend you enable data deduplication if your backup jobs contain several VMs that have a lot of free space on their logical disks or VMs that have similar data blocks - for example, VMs that were created from the same template. With data deduplication enabled, Veeam Backup & Replication does not store to the resulting file identical data blocks and space that has been pre-allocated but not used. All subsequent backup files in the backup chain will also use the new compression level.ĭata deduplication decreases the size of files. Veeam Backup & Replication will retrieve data for the whole VM image from the production infrastructure and compress it at the new compression level. If you want the newly created backup file to contain data blocks compressed at one level, you can create an active full backup. The same behavior applies to synthetic full backups: synthetic full backups created after the compression level change will contain a mixture of data blocks compressed at different levels. As a result, the full backup file will contain a mixture of data blocks: data blocks compressed at the Optimal level and data blocks compressed at the High level. In the reverse incremental backup chains, the full backup file is rebuilt with every job session to include new data blocks. After several job sessions, you change the compression level to High. For example, you have a backup job that uses the reverse incremental backup method and the Optimal level of compression. However, if you use the reverse incremental backup method, the newly created backup files will contain a mixture of data blocks compressed at different levels. Previously created backup files will not be affected. Veeam Backup & Replication will automatically apply the new compression level to the newly created backup files after you save the settings. After you change the settings, you will not need to create new full backups to use new settings. You can change data compression settings for existing jobs. For more information on backup properties, see Viewing Backup Properties. In the properties of the backup created with encryption, you may also see that the backup size (the Backup Size column) is larger than the original VM size (the Original Size column). For more information on job statistics, see Viewing Real-Time Statistics. Therefore, in the job statistics, you may observe a higher amount of transferred data (the Transferred counter) as compared to a job for which encryption is disabled. If encryption is enabled for a job and the Decompress backup data blocks before storing check box is selected in the settings of the target backup repository, Veeam Backup & Replication does not compress VM data. Select this level to use compression settings of the copied backup files.
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