Good to know that you can still Sign In at Uphold and thereby keep track of your BAT, there.
Meanwhile, if you continue to participate in Brave Rewards - ‘paying attention’ to ads, then vBAT should accumulate in your Brave Browser installation’s now un-verified Brave Rewards account/wallet (lower-case lettering for ‘wallet’).
So, be sure to routinely back up the BraveSoftware folder . . .
I recommend backup of the ‘Brave-Browser’ folder’s parent: BraveSoftware folder, for technical reasons, to also save other items, let us say, about the sub-folder.
Saving the parent folder, tends strongly to keep the Brave-Browser folder intact. And I would want that, especially in Windows OS situations.
Better chances when restoring, to drag-copy the Brave-Browser folder (or contents of interest therein) . . . that was/were saved within the backed-up BraveSoftware folder.
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The security credentials of a previous OS installation, used for encrypting and decrypting the passwords of the username-and-password combinations stored by the Brave Browser > Password Manager, are NOT in the Paths mentioned.
Therefore, in order to preserve the passwords, some backup method needs to be employed, and that might be one or more of:
Brave Sync (PROBLEMATIC/UNCERTAIN)
Export passwords to .CSV file
Third-party password manager such as 1Password, BitWarden, KeePASS, LastPASS (examples)
IF a Brave Browser user is willing to hack and struggle, in order to TRY to recover passwords, then read the following steps plus additional replies, at: