what's important is always backup your pc data profile because someday you'll be able to use it specially those extension softwares related to cryptocurrency wallets.
Backing up your seed/private key should be a priority instead of backing up appdata/local extension data. While it might help you with recovery, with your seed/private key, it would be way easier.
Exactly.
You wouldn't find any hassle nor problems if you do just simply save up that seed/key which had been asked for you to save when you are just
still creating your metamask wallet.
In case you do experience some unexpected problems then you wouldn't really be having a hard time on importing it anytime as long you
do have that needed keys.