Sync isn't designed as a permanent backup – it's just sharing what is saved locally. If you reset your password and your data isn't stored on at least one other device, you could lose all the information associated with the old password. That's why you'll want to install Firefox and use Sync on more than one device.
Sync jako trajne zawěsćenje mysleny njeje – zmóžnja jenož dźělić, štož je so lokalnje składowało. Jeli sće swoje hesło wróćo stajił a waše daty njejsu so na znajmjeńša jednym graće składowali, móhł wy wšě daty zhubić, kotrež su ze starym hesłom zwjazane. Tohodla wy měł Firefox instalować a Sync na wjace hač jednym graće wužiwać.