Hi @Larry,
Welcome to Microsoft Q&A!
I don’t think you can use the .suo file to recover the breakpoints and bookmarks, although they are stored in the solution's SUO file.
If you want to back up the breakpoints, you can export and import your breakpoints as an XML file.
However, exporting bookmarks is not supported currently. It has been reported to Product Team in Developer Community:
Allow developers to export bookmarks in Visual Studio - Developer Community
Alternatively, you can refer to the similar issue and add a custom token to record your bookmarks.
Relevant document:
Use the Task List to track and use code comments - Visual Studio (Windows) | Microsoft Learn
Sincerely,
Anna
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