I can give you a for your specific situation.
Cloud syncing is great, but it isn't perfect. Sync errors can occasionally wipe out folders or create duplicates. By copying the Bookmarks file to an external drive or cloud storage once a month, you ensure that you never lose years of curated research and favorite sites due to a software glitch. Common Issues and Fixes Can't find the AppData folder? chrome bookmarks file
Open Finder, press Shift+Command+G, and paste: ~/Library/Application Support/Google/Chrome/Default/ I can give you a for your specific situation
Did you just accidentally delete a folder of bookmarks right now ? chrome bookmarks file
Inside the folders mentioned above, you will likely see a second file called Bookmarks.bak. This is an automatic backup created by Chrome every time you launch the browser.