They shouldn’t be… but stranger things have happened with Brave…
Use the following to backup your User Data folder. You can find the file path at brave://version. You can restore it if for some strange reason you need to restore. Also, I suggest backing up the entire Brave-Browser folder separately. I backup routinely at the end of the month and periodically during the month especially if I am “experimenting” with settings and flags.
Please note, you are not doing a pc reformat or Brave installation, so your BAT should be safe. This is just to provide you with general information and show you backup/restore instruction.
Source: can i create bats backup? - #4 by CerealLover