Acronis Backup for Windows Server Essentials - User Guide - Manual (Page 405)

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or %PROGRAMDATA%\Acronis\BackupAndRecovery\MMS\Temp (in Windows Vista and later
versions of Windows).
You can specify a local folder on any volume, including a volume you are backing up.
Pre-allocated storage size (in Megabytes)
Description: Specifies the initial size of the snapshot storage, in megabytes.
Possible values: Any integer number between 0 and 2147483647
Default value: 0
If this setting is 0, the management server uses the Pre-allocated storage size (in percent)
setting.
The initial size will not exceed the available space minus 50 MB.
Pre-allocated storage size (in percent)
This setting is effective only when the Pre-allocated storage size (in Megabytes) setting is 0.
Description: Specifies the initial size of the snapshot storage as a percentage of the disk space
that is available at the time of starting the backup.
Possible values: Any integer number between 0 and 100
Default value: 50
If this setting is 0, the snapshot storage will not be created.
The initial size will not exceed the available space minus 50 MB.
Without the snapshot storage, taking snapshots is still possible.
The size of the snapshot storage does not affect the size of the backup.
Online Backup Proxy
Specifies proxy server settings for connection to Acronis Cloud Storage over the Internet.
This parameter has the following settings:
Proxy
Description: Specifies whether to use a proxy server
Possible values: Enabled or Disabled
Default value: Enabled
If the value of this parameter is Disabled, all of the following parameters are ignored.
Proxy server address
Description: Specifies the name or IP address of the proxy server
Possible values: Any string 0 to 32765 characters long
Default value: Empty string
Proxy server port
Description: Specifies the port number of the proxy server
Possible values: Any integer number between 0 and 65535
Default value: 0
Online Backup Proxy Credentials
Use the following two parameters if the proxy server for connection to Acronis Cloud Storage
requires authentication.
User name
Description: Specifies the user name for authentication with the proxy server
Possible values: Any string 0 to 32765 characters long