How to auto delete removed file's undo/backup ?

Hello all,

I have setting in my .vimrc to put all the undo/backup in a specific folder. And now it has taken up too much space(around a hundred megabytes, say). Many files are no longer needed because the original file has been removed. I'm not good at scripting and all I come up with is to parse the filename and test its existence. So I'm wondering if there're easy ways to clean them up. any suggestion is welcome

Best Regards,
Linus Boyle

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