Going on Safari

I need a way to back up photos while on safari. I won't be taking a laptop. I'll just have a Google pixel 10 phone. I'm not sure I can count on wifi enabling a backup to the cloud. I have a SanDisk 1T SSD. Worst case I can back up the cameras SD card to the phone and then the phone to the SSD and then delete files on the phone. Rinse repeat on a daily basis.

My phone can't mount the two storage devices at once. That would be the ideal solution.

Anyone solve this problem?