Hi @ryosukefc,
I’d recommended backing up your entire Brave profile.
The path should look something like this:
Users\YOURNAME\AppData\Local\BraveSoftware\Brave-Browser\User Data
Within the User Data folder, there should be another folder called Default, that Default folder contains all you info. If you’re using multiple profiles, you’ll also see a folder called Profile 1. Profile 1 is actually your second profile, if you have a third profile it will be called Profile 2. If you have deleted profiles in the past, those numbers may be different.
Be sure to store your Default folder somewhere safe (and any additional profiles you have) - you can then copy that Default folder into a new installation of Brave.