User's Manual

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Compression level
You can choose the compression level for a backup:
 None - the data will be copied without any compression, which may significantly increase the
backup file size.
 Normal - the recommended data compression level (set by default).
 High - higher backup file compression level, takes more time to create a backup.
 Maximum - maximum backup compression, but takes a long time to create a backup.
The optimal data compression level depends on the type of files stored in the backup. For example, even
maximum compression will not significantly reduce the backup size, if the backup contains essentially
compressed files, like .jpg, .pdf or .mp3.
You cannot set or change the compression level for a pre-existing backup.
Operation priority
Changing the priority of a backup or recovery process can make it run faster or slower (depending on
whether you raise or lower the priority), but it can also adversely affect the performance of other
running programs. The priority of any process running in a system, determines the amount of CPU
usage and system resources allocated to that process. Decreasing the operation priority will free
more resources for other CPU tasks. Increasing backup or recovery priority may speed up the process
by taking resources from the other currently running processes. The effect will depend on total CPU
usage and other factors.
You can set up the operation priority:
 Low (enabled by default) - the backup or recovery process will run slower, but the performance
of other programs will be increased.
 Normal - the backup or recovery process will have the equal priority with other processes.
 High - the backup or recovery process will run faster, but the performance of other programs will
be reduced. Be aware that selecting this option may result in 100% CPU usage by Acronis True
Image 2021.
Network connection transfer rate
When you back up data to Acronis Cloud, you can change the connection speed used by Acronis True
Image 2021. Set the connection speed that will allow you to use Internet and network resources
without annoying slowdowns.
To set up the connection speed, select one of the following options:
 Maximum
The data transfer rate is maximum within a system configuration.
 Limit to
You can specify a maximum value for data upload speed.
Snapshot for backup
This option is for advanced users only. Do not change the default setting if you are not sure which option to
choose.
During a disk or partition backup process, which often takes a long time, some of the backed-up files
may be in use, locked, or being modified in one way or another. For example, you may work on a
document and save it from time to time. If Acronis True Image 2021 backed up files one by one, your
open file would likely be changed since the backup start, and then saved in the backup to a different