Thanks for responding. It's my Mac and software. I've built it up over the years as a designer, musician, photographer, etc. It does have a lot of software, which I bought over time and kept up to date - as I'm sure you know when you're working professionally, you need all the good equipment you can get. It's not a corporate machine, so there's no IT.
So far as I know, the only anti-malware I have is Intego. -I can run a full scan with Virus Barrier just once a week. And I can definitely disable its real-time scanning when I'm using the heavier software. That's a great idea.
One reason I got this particular machine is that I do research into a multimodal language (words, sounds, images and gesture) - and the old InteI machine couldn't hold up anymore. That's why I need this Mac to run at its best - so it can run all this software at different times (not at the same time).
I could pare down some of the software to only the things I need. And I can definitely move the photos and audio to separate SSDs - to spread the load.
For file-hosting tools, I used Dropbox, but they drove me crazy with marketing and the cost. So, I keep three copies - 2 on disks and 1 on Backblaze - simple spinning hard disks, not SSDs (except for speed). The disadvantage of having done this stuff for decades is all the stuff you want to keep. I have a few things on YouTube and Vimeo, and I host them there for the image quality and link them to my website. What specific file-sharing software were you referring to?
I've definitely made every mistake there is. But now, at 76, I can't afford not to stay smart :) Thanks for all your input MrHoffman - it's much appreciated.
Best wishes,