

I’ll assume it’s cool, but currently hugged to death for me. Just wanted to point out batteries are replaceable even if glued, fixed my GrapheneOS Pixel7 after it killed itself (spicy pillow) charging in heat in a warmer country. iFixit kit + video worked, then got a Chargie which lets you set a temperature above which it will not charge (33C for me, only charges at night in summer). Probably relevant in your case.
Zeroth, consider GrapheneOS on that Pixel.
First, Syncthing on the PC and Syncthing-Fork. Now you can sync (and anything else) your photo files from phone to PC and vice versa. Congrats, you have photo storage backup.
Second, either a vpn to your home network so you can backup on the road, or Immich (as elsewhere suggested) for your own google photos experience.
Third, whichever of second you didn’t choose.
Fourth, get ye an offsite backup (search 3-2-1 backup). rclone is your friend, but encrypt first locally with Cryptomator, then you don’t have to trust your storage provider.