Backup OP-1 without PC?

https://www.operator-1.com/index.php?p=/discussion/3645/created-an-on-the-go-way-to-sync-my-op-1-with-a-raspberry-pi-using-a-lcd-screen-for-input-output

I want to give this person money for one.

@dinraum said:
What are the main key features of a wireless card reader that will work with the OP-1?

There are cheap ones like Hizek (10 EUR) Meco (20 EUR) with different feature sets,or this RAVPower (40 EUR).

Which one will work with iOS?

did you ever tried this >?

Yes the RAV power Works.

@dinraum said:
Yes the RAV power Works.

thanks