cbt_mode

--cbt_mode={on|off}

This parameter determines whether to use Changed Block Tracking (CBT) when performing an incremental or differential backup.

The CBT technology accelerates the backup process. Changes to the disk content are continuously tracked at the block level. When a backup starts, the changes can be immediately saved to the backup.

Available parameter values

• on (by default)

  Acronis Cyber Protect automatically enables CBT for each virtual machine that is backed up. The resulting CBT settings determine CBT usage during the backup and are kept after the backup is completed.

• off

  Acronis Cyber Protect does not use CBT.

Restrictions

Because of the CBT support limitations in VMware vSphere, use of CBT is not possible in these cases:

• The virtual machine version is earlier than 7.
• The virtual machine has a Raw Device Mapping (RDM) disk attached in the physical compatibility mode.
• The virtual machine has a disk attached to a shared virtual SCSI bus. Use of CBT for the disk is possible only when the SCSI Bus Sharing setting is None.

The presence of snapshots, although it is a CBT support limitation in VMware vSphere, is not a restriction for using CBT in Acronis Cyber Protect.