Write to support@selvola.com. One person reads it, so please include what you were doing and what happened.
On your device, in the app's own storage. There is no server holding a copy, which also means nobody can recover it for you.
More → Export My Data. It writes a JSON file that can restore everything and a CSV you can open in a spreadsheet. Do it regularly and keep the file somewhere you trust.
Export on the old device, install Steadybook on the new one, then Restore From a File, on the setup screen, before creating a business. Restoring only works into an empty app: merging two books would need rules that could get your ledger wrong.
No. Reminders are scheduled by iOS on your own device. Steadybook sends nothing to anyone.
Not in 1.0 — each device keeps its own book. Export and import moves a book between them. Syncing through iCloud is planned for a later release.
No. Steadybook is not built for protected health information and makes no HIPAA claim.