User guide

If CBT is enabled for a virtual machine, Acronis Backup & Recovery 11.5 uses CBT according to the

CBT settings of individual disks. Otherwise, CBT is not used.

Use this value for all backups (including full ones) if you want to preserve your custom CBT

settings for virtual machines.

 off

Acronis Backup & Recovery 11.5 does not use CBT, regardless of the CBT settings for the virtual

machines.

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 Backup & Recovery 11.5.

3.6.14.3 compression

--compression={none|normal|high|max}

Data compression level. If not specified, the value is normal.

3.6.14.4 encryption

--encryption={none|aes128|aes192|aes256}

The algorithm to encrypt the archive. If not specified, the value is none.

This parameter cannot be used without the --password (p. 119) parameter.

3.6.14.5 fast

--fast

Defines whether a file change is detected using the file size and time stamp or by comparing the file

contents to those stored in the archive. Use this parameter to speed up incremental and differential

disk-level backup.

If specified, the software determines whether a file has changed or not by the file size and the

date/time when the file was last modified.

If not specified, the software will compare the entire file contents to those stored in the archive.

3.6.14.6 hdd_speed

--hdd_speed=<speed>{kb|p}

The speed of writing the data being backed up to a hard disk.