> I have an older M2 Mac mini that does the OCR and visual description of all my screenshots. Screenshots are stored on my NAS.

Doesn't Apple do this already within it's OS all locally? It certainly does it for OCR and categorization.

EDIT: Also, no reason to use a generic LLM for this. This functionality exists in something like Immich (both OCR and 'context categorization'), and doesn't tie you into the Apple ecosystem either.