I don't know. I had ten of thousands of files once and wanted to delete them. Dropbox client hangs and then gives an error. API doesn't work with that many file

I don't know. I had ten of thousands of files once and wanted to delete them. Dropbox client hangs and then gives an error. API doesn't work with that many files, web version doesn't work either. I ended up writing a script that uses API call for every separate file and it took like 3 days to delete them all. I really don't think they handle many files well after that experience and wouldn't trust them if I needed really a lot of files in the future.