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 njejo myslony ako trawne zawěsćenje – zmóžnja jano źělić, což jo se lokalnje składło. Jolic sćo swójo gronidło slědk stajił a waše daty njejsu se na nanejmjenjej jadnom rěźe składli, mógał wy wšykne daty zgubiś, kótarež su ze starym gronidłom zwězane. Togodla wy měł Firefox instalěrowaś a Sync na wěcej ako jadnom rěźe wužywaś.