I'm a travel photographer (which means I travel a lot, carry lots of cameras with me and shoot every day while traveling). So, what you are talking about is always my biggest problem or challenge. I think about it all the time and am willing to learn. But I'm stuck in my ways. I know what I want, what I need and what I like.
What do I take with me from my home studio 8TB internal SSD on my PC (that I built) which stores my life's work (backed up a bazillion times to external 10TB spinning drives)? Nothing. Why would I?
My travel-shooting 4K high-end 15-inch laptop is a blank slate with a zeroed-out catalogue. I shoot and edit in LR on the road and post the results (export full-size JPEGs) to Flickr daily. (I'm shooting in Sardinia right now if you want to look - I've posted 500 shots the past 2 weeks.)
I back up my work on the road from the laptop to a 2TB external SSD. When I get home, I copy my images and their sidecars into my base-PC 8TB SSD and import them to my only catalog. Then I delete everything off my laptop.
1. I don't use Raid. Been there. Done that. No way. Raid is dead to me and soon will be to everyone. What we need is big 8TB NVMe M.2 PCIe Gen 4 or 5 SSDs. Will happen soon at less than 400 bucks. Nirvana. That is the equivalent of storage paradise. That will kill Raid forever. Thanks be to God.
2. I would not touch LR cloud and those small smart previews unless someone flew to San Antoino and paid me a lot of money while giving me the best sales-pitch since I bought that boat I didn't need.... But I could be wrong. Never used it. Won't use it. Why? Because I want to see my work at full pixel res while I edit, export and the entire work-flow.
3. If you want to take some previous work with you on the trip (but why?), copy the files and their sidecars to an external spinning drive or SSD. Take them with you. If you want to use them on the road, just import them into your travel cat. Takes 30 seconds. Then you can use them in your laptop however you want. But why? When you are traveling, you just care about what you are shooting on that trip.
But that is just me. We all have different needs and expectations.