Backup piCorePlayer without removing SD card

I have piCorePlayer on a Raspberry Pi 4 with the official 7" touchscreen fitted inside a touchscreen case that doesn't allow access to the SD card. I've removed the back of the case a couple of times already to get the to the SD card, which has already caused the screw threads on the back of the touchscreen to loosen, making the touchscreen slightly loose in the case.

I'd like to create periodic backup copy/image of the piCorePlayer SD card to another SD card without having to take apart the touchscreen case, ideally using a USB SD card adapter plugged into the Pi's USB socket - in the same way as 'SD Card Copier' works in Rasbperry OS.

Is there anyway I can achieve this within the piCorePlayer OS - or perhaps another way via SSH or SFTP to another PC? Ideally, I'd like to be able to put the backup SD Card I create straight into another Pi and boot piCorePlayer straight from that (in case I want to use it in a Pi case without a touchscreen in future).

Any tips?

Thanks

Andy