I cannot figure where the setting on Brave that would say: Wipe all Passwords on WiN10 update
Go to your backup, and restore the following file:
Windows path: C:\Users\ [YourUserName]\AppData\Local\BraveSoftware\Brave-Browser\User Data\Default
Obviously, substitute your computer username for [YourUserName] in the above path. You should find the Brave password store there. Once you’ve restored it from the backup, you can go into the Brave options and export the passwords to a .csv you can copy to a flash drive.