Plesk backup completed with warning: psacontentfile.FileAccessException Access to the path is denied

Symptoms

• Backup completes with warnings:

  WARNING: (domain object 'example.com') [e4404190-b0b5-425e-a309-500e258cfe97]: Unable to get attributes of the file C:\Inetpub\vhosts\example.com\httpdocs\img\originais\photo.jpg: Access is denied. The file will not be archived. [:0]

• The following error can be found in %plesk_dir%admin\conf\php_error.log:

  psacontentfile.FileAccessException: Can not open for reading file "C:/Inetpub/vhosts\example.com\httpdocs/file.jpg". Access to the path 'C:\Inetpub\vhosts\example.com\httpdocs/file.jpg' is denied.

• System user of a subscription does not have access to this file:

  PS Get-Acl C:\Inetpub\vhosts\example.com\httpdocs\file.jpg | Format-List
  Path : Microsoft.Powershell.Core\FileSystem::C:\Inetpub\vhosts\example.com\httpdocs\file.jpg
  Owner : WIN-TESTWM\S-1-5-21-2700000000-1230000000-1950000000-1084
  Group : WIN-TESTWM\None
  Access : NT AUTHORITY\SYSTEM Allow FullControl
  Audit :
  <...>

• Website prompting for credentials when the dedicated application pool is enabled in Domains > example.com > Dedicated IIS App pool for website > Switch on.

• Failed requests tracing shows that there are Access is denied records for some domain's files:
  

Cause

Wrong permissions for domain files.

Resolution