Hi
For Bookmarks, they are normally backed up in bookmarks.bak, located at (this is for Windows PC) :
%LocalAppData%\BraveSoftware\Brave-Browser\User data\Default
You need to
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go to https://rongjiecomputer.github.io/chrome/bookmark-recovery/#windows to recover them by converting ‘bookmarks.bak’ to ‘bookmarks.html’
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Import the converted html file to Brave from here
brave://settings/importData