![]() Data that did not change on disk during backup is transferred from the source volume.Veeam Agent copies data from the following sources:.If checksums do not match, Veeam Agent will copy the data block to the target location during the next backup process step. Veeam Agent calculates checksums for each data block and compares them with checksums from the backup file created during the previous job session.Veeam Agent copies the partition table and bootloader located on the hard disk to the backup file in the target location. ![]() To learn about full and incremental backup, see Backup Chain. In this case, backup requires greater time. In such case, to detect what data blocks have changed since the previous job session, Veeam Agent rescans the entire data added to the backup scope and creates a new changed block tracking map. DRIVE SNAPSHOT GUIDE DRIVERMind that every time the driver is unloaded or the Veeam Agent computer is rebooted, the changed block tracking map is reset as well. The driver keeps this information as a changed block tracking map in the RAM of your computer. ![]() Veeam Agent uses the Veeam Agent for Linux Driver to detect what blocks have changed on the volume since the previous job session.Instead, Veeam Agent leverages Btrfs capabilities to create a Btrfs snapshot. During backup of data that resides in the Btrfs file system, Veeam Agent does not use its driver to create a snapshot.To learn more, see Backup of Database Systems. If you instruct Veeam Agent to back up a database system, Veeam Agent prepares databases for backup before creating a snapshot of the volume. ![]()
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