Various tips that may help in the future.
Possibly a related issue, that you might want to look over - July 2019:
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Mac - Bookmarks file size:
On the chance that you have used the default user profile aboard your Mac, then the Bookmarks file is probably located at:
/Users/user_shortname/Library/Application Support/BraveSoftware/Brave-Browser/Default/Bookmarks
Without much info in that Bookmarks file, it would be around 4KB or less in size.
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Back up your Bookmarks file.
Mac / Windows routines - in a Brave window, go to: brave://bookmarks/
Locate the Menu button — possibly near the Search (Magnifying Glass) icon
Click on that button, and select “Export bookmarks”
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Android phone
In Brave for Android, somewhere around the periphery of the Brave window, find the 3-dot button and select it.
Choose Bookmarks.
Find the “< Back” button and keep tapping it until it disappears.
In the lower left-hand corner of the Bookmarks window, you should see a small rectangular icon with an upward pointed arrow symbol in it – select that.
A pop-up should appear, in which you may choose to “Export Bookmarks”
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For all Internet browsers, users need to manually back up the Bookmarks file(s). IMHO