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: Zyzzyva's active-sync engine won't link up with a Dropbox app folder that it didn't create, so, we recommend you start your Dropbox sync relationship by doing an active sync of your habitual Zyzzyva installation, the one that has your “good” quiz data.)
When firing up any new NZ or NZM installation, press the ''Sync'' button, sign in to Dropbox and give permission when prompted, and then — please! — if you see prompts about conflicted items, read those questions before you agree to proceed with the sync. The first time you sync, there may be conflicts between older, useful cardbox/quiz-statistics 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 Zyzzyva’s active-sync engine 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, Zyzzyva 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.
=== How do I move cardbox data forward when moving to a new lexicon? ===
There is one ''Anagrams'' cardbox for each lexicon, and the contents won’t automatically be brought forward when you begin to study a new one. When a new lexicon is released and you want to move your quiz statistics and cardbox data forward, the simplest way is to use Zyzzyva’s import features. In NZ’s ''Cardbox'' tab, target the new lexicon, then click ''Import…'' and choose the old lexicon; in NZM’s ''Manage'' tab, target the new lexicon, press ''Action'', choose ''Import From Lexicon'' and choose the old lexicon. Either way, your ''Anagrams'' cardbox data will come over, along with the rest of the quiz history for that lexicon. (That’s why, when the import finishes, the number it reports will probably be larger than the number of questions in your cardbox.) If you use Zyzzyva’s data-synchronization feature, this update will sync to all of your devices along with the rest of your data directory.