New System, is it possible to save some files for revalidation rather than redownload it all?

You can save your Offical and Comunity Folder outside of the “main MSFS” Folder with the folders “LocalState” etc in it. Even when you uninstall MSFS the Offical and Comunity Folder remain on the hdd.

The “main folder” is about 50GB
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The Offical and Community Folder is about 700GB (i have a lot of scenery installed)