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On your phone only, in the app's private storage. There is no account and no server, and the app does not even have internet access.

No. The app's data is left out of Android's backup and is not copied to a new phone automatically. Create a PDF export before you change phones: your treatment history then survives in a readable form.

Because you add a photo with the system photo picker: the app only receives the picture you choose, and keeps a copy of it in its own private storage.

No. The app never writes photos to the shared gallery. The original stays where it was: the app does not change or delete it.

No, the app sends no notifications. You will find planned appointments at the top of the Journal, in the Calendar and under Plans; it also marks an appointment whose date has passed.

What you select: treatment history, spending report, plans and advice. Photos are left out by default; they only go into the file when you switch that on. A file you have shared is your responsibility.

In Settings you can switch on “Hide photos” and “Block screenshots”; both are off by default. The app has no password of its own: your phone's screen lock protects it.

Yes, in Settings. Switching does not convert amounts you have already entered.

No. Under Advice you write down what your professional told you. The app itself gives no advice, does not assess your skin and does not recommend treatments or products.

One item at a time in the app, or everything at once: Settings → “Delete all data”. Uninstalling the app removes everything as well.

Hungarian and English. With System the app follows the phone's language when that is Hungarian or English; with any other language it is shown in Hungarian.