SYMPTOMS
Plesk backup containing MS SQL database fails to be restored. The following error is displayed:
Failed to restore client 'NAME' : String or binary data would be truncated.
RESOLUTION
Please download the following file
http://download1.swsoft.com/Plesk/Autoupdate/Windows/8.3.0/129951/psabackup.dll
and place it to the %plesk_bin% folder
Note: Please see how to install Plesk hotfixes properly.
Additional information
%plesk_dir% is environment variable which points to Plesk installation folder. By default it is C:\Program Files\SWsoft\Plesk
%plesk_bin% is environment variable which points to Plesk binaries folder. By default it is C:\Program Files\SWsoft\Plesk\admin\bin