Article from Plesk: https://www.plesk.com/kb/support/how-to-remove-plesk-backup-files-and-their-logs/
Solution adjusted a bit with correct paths:
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For Plesk Obsidian on Windows Server
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Connect to a Plesk server via RDP.
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Find the backup_infoXXXX.xml file using a backup creation date:
C:> "C:\Program Files (x86)\Plesk\admin\bin64\pmm-ras.exe" --get-dump-list | findstr .xml:
In this example, the domain level backup was created on 22 July 2020:
C:> "C:\Program Files (x86)\Plesk\admin\bin64\pmm-ras.exe" --get-dump-list | findstr .xml:
<message>backup_info_2007220826.xml: </message>If Plesk was installed into a custom location, replace C:Program Files (x86) in the command above with the custom location
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Remove the backup by specifying the corresponding *.xml file. For example:
C:> "C:\Program Files (x86)\Plesk\admin\bin64\pmm-ras.exe" --verbose --debug --delete-dump --dump-specification=backup_info_2007220826.xml
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