Scrath

Depending on how you define multiple operating systems, you can use proxmox

You can use a gps logging app (I use gps logger on android) to create gps tracks and sync them with your photos via the timestamp. Digikam has a tool for that built in, not sure what other software supports it.

This way I don’t have to manually tag every photo but instead only those where the gps failed because I was underground or where I forgot to turn it on

The Fractal Design Define R cases can house a lot of hard drives, but they are kind of big. My Define R6 can theoretically house 11 3.5" drives iirc in addition to 4x 2.5" but it does not come with that many drive sleds out of the box. For the 2.5" drives only 2 sleds are included. I think for the 3.5" it was about 6.

Honestly, I’m really happy with the ability to just try out stuff with docker and then nuke the entire compose stack if it does not work. I also know perfectly where any possible leftovers from the attempt are (the bind mounts or volumes) and can be certain I deleted everything I “installed”.

Although I have to admit that I absolutely had some issues with containers in the past, mainly when there are two or more containers with dependencies on one another

For phone <-> PC I use localsend. If I do PC to PC, possibly even large amounts of files or large files in general I put them on a network drive specifically intended for that purpose

I know you didn’t mention video but if you think you might want to host jellyfin in the future, make sure your CPU supports hardware decoding for modern formats.

For example, my lenovo mini pc with an i5-6500 has support for h265 but not h265 10bit or AV1, which makes playing those formats on some devices basically impossible without re-encoding the files.