Both NZ and NZM can operate on cardboxes that are synced with Dropbox cloud storage, and in that way, multiple devices can sync their cardbox/quiz-statistics databases with each other. In the case of NZ up to version 3.3.0, you won’t see any mention of syncing in the application interface, but you can use the ''Preferences'' dialog to make it look for its data directory in a location that Dropbox is passively syncing in the background (though NZ doesn’t actually move the data for you, so you’ll have to do that yourself). NZM, on the other hand, is programmed to sync actively with Dropbox, without an installed Dropbox app, and has a ''Sync'' button for that purpose. To bring multiple devices' Zyzzyva data directories into sync, they all need to target the same '''<tt>Apps/Zyzzyva</tt>''' folder in the same user's Dropbox cloud storage. (Important: If you are using NZM, you should sync your mobile devices to Dropbox first, because Zyzzyva's active sync engine won't link up with a Dropbox app folder that it didn't create. Then, on your desktop devices, install the Dropbox installation is application, set it up for automatic syncing of the '''<tt>Dropbox</tt>''' directory in inside your home directory, then you should retarget NZ’s data directory to '''<tt>Dropbox/Apps/Zyzzyva</tt>''' and move or merge your data thereso that Dropbox can manage them. Having done that, you’re now ready to sync with other desktop and mobile all of your devices through Dropbox. ) NZM, on the other hand, is programmed to sync with Dropbox on its own and has buttons for that purpose. If you’re When firing up a any new NZM installation, and already have a usable data directory waiting in the right location on Dropbox, you can start by pressing press the ''Sync'' button, signing sign in to Dropbox and giving give permission when prompted, and then — please! — read the if you see prompts about conflicted items , read those questions before you agree to proceed with the sync. For The firsttime you sync, there may be conflicts between older, useful cardbox/quiz-time usestatistics databases on Dropbox and newer, but useless databases just established on your mobile device; if so, you should tell it to sync in one direction only, from Dropbox to your mobile device, by answering ''Yes'' to the first question and ''No'' to the second before answering ''Yes'' to start syncing. It will take a while, and it will try to keep your device awake, because NZM isn’t programmed to pause a sync and finish it later; since iOS tolerates only short periods of background activity before killing an active app, you should let it run in the foreground. After one or more tries, having completed this initial sync, NZM will only sync files that have changed, so it’ll be very quick. The one thing to remember, to avoid disappointment, is to sync when you start cardboxing and again when you stop, because otherwise you could end up with two or more devices that both think they have newer cardbox data, and this will be flagged as a sync conflict later on.