[...] at least a backup of your wallets inside the wallet folder of electrum or your recovery seed before uninstalling electrum since the entire electrum folder will be removed in the process
The data directory ("%APPDATA%\Electrum") is left intact when Electrum is being uninstalled. It never hurts to have an extra backup, though.
Oh, good thing if it's the case, I usually do it for extra extra backup just in case though.