If you still have the negatives, get them scanned.

If you don’t have those negatives anymore, get your photos scanned asap and retouched to remove those defects. Some could be easy to remove, some could be a bit more challenging depending on the location in a picture (removing a red dot in a blue sky is way easier than removing those on complex structures).

It could be chemicals not washed out during development (as someone else already mentioned), could also be dust particles (like some chemicals in powder form, concrete dust, …) in combination with high humidity.

If you print images to have them last long (really long like tens of decades) have them printed with Canon or Epson fine art peinters on high end papers. Chemically developed prints will fade way faster. (source: Wilhelm Image Research)

The still have a perpetual license.

have you tried zip compressing your tifs? (I know, it’s not converting them…)

I gueas after 10k shots you just learnt how the camera behaves and what the photo might look like with this camera when you take it.

What do you provide for 1000 bucks that someone else doesn’t provide for 300 and that’s worth the 700 difference?

file server in my office + backup in my office + backup at home

before that: Synology NAS <- easy to set up & forget (and backup to another Synology box)