How to delete all files from my backup that arent currently on my laptop?

[CuriousVulture]

Hello,I have a backup set up through windows backup service on an external disk drive, i would like to clean up this backup and delete older files and versions of files, the problem is when I use the builtin tool to do that I read "The cleanup deletes versions of files and folders older than the selected age, except the most recent version of a file and folder"I would actually specifically like to delete files that were backed before a certain period because i have deleted them from my laptop since and no longer need them. I want to delete files including the most recent version of a file and

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