Where can I manually find my browser data and saved passwords and retrieve/save them?

@deafguy64,
You are likely encountering the same issue as these users here:

We are working to get this issue resolved. To be safe, I would go ahead and backup your entire User data folder which you can find (in Windows) by going to:
C:\Users\MYUSERNAME\AppData\Local\BraveSoftware\Brave-Browser\User Data\