My new backup laptop (Windows 10) has a tiny hard drive. Even after making several Dropbox folders online only, I still can't get Dropbox to finish syncing. And I want the files available offline on my main laptop (also Windows 10), where I need mp3 music files to be run in synch with karaoke (document) files with no audible latency. Is the online/offline switch device-specific or is it set across all my devices including my iPhone?