What would be a good diff tool for matching files based on name, size, etc and some degree of heuristics for fuzzy matching? I'm restoring a backup of >10TB from Google Drive, and I want to check ...

You can search on name, sender, date, file type, keyword, content, and other attributes regardless of where the file is located. That's a lot, but it's not the hard part.

Whether you're searching your entire computer for a file or want to run a highly refined search, use these Windows and macOS tools to get the job done.