In addition to the uSD card, you need to buy a uSD card reader, which can be read via USB and written with a writing program.
Make sure that the USB can be connected to both the PC and zbitx. To the PC when you download the Image, to zbitx when you want to make a backup.
Since the published Image is in .zip format, you have to unpack it first, which is 32GB in size here.
It may happen that during production, the 32 GB SD card cannot be written to, because the new card is a few bytes smaller than the Image.
That is why you may have to buy a 64 GB card.
If the creator of the Image is more skilled, he will remove the empty part of the card using the shrink method, and the Image could be much smaller.
It is advisable to buy a good quality uSD card, which can also be used for Backup.
Don't worry, if you insert a 64GB uSD into the device, you can copy it to a smaller size than Backup using Raspberry->Menu->Accessories->SD Card Copier.
It is advisable to make a Backup, if you have successfully set the .ini files, you can use the Backup to restore in case of an error.
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Gyula HA3HZ
HA3HZ