How to backup msfs

if win 10 has to be reinstalled, how can the msfs be backed up beforehand to prevent a new installation of msfs? win is on drive c msfs is on drive e. After a fresh install of win 10, appstore first download 1,7 gb, and msfs Start to download 95 GB. Can i prevent this huge download ?

In order not to download everything, rename your “OneStore” folder to
toto_store, for example, by windows, remove MSFS, rename your
OneStore folder, and relaunch an install. Theoretically, you are not going to
download only the launcher (900Mo) and what you are missing in the
OneStore folder. Of course you reinstall in the same location.

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oh thank you, ok. I’ll try your way. I had never read about it anywhere else, thank you.