You may not be aware, by stopping Apple you are enabling Skynet

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I am used to XE just because I’ve used it since, like, forever. I just uninstalled and see if this app Currencies fits the bill.

I don’t have an account there, I only use the app when I need to know what are the rates at that moment.

Not FOSS, but XE is what I use for currency exchange

Iirc, you are entitled to have/create a backup of your physical media, as long as it is for your personal use.

TPM storage, perhaps?