SymptomsA backup or migration process hangs for a long time at the initial step, showing the saving… message. You may even find a System.OutOfMemoryException in log files.
CauseThe issue may be caused by having a large number of custom logos in the %plesk_dir%\admin\htdocs\images\logos folder and records about them in the psa.logos table.
ResolutionClear the unneeded logos from the mentioned folder and database table:
3) Check what logo is used by the admin:
The command will show you the ID of the admin logo and the name of the admin logo file.