I more-or-less agree with you, but I handle some bits a little differently.
I’ve got a pair of RAID boxes, each with 5 spinning HD’s, about 20 TB in all. The nice thing about the RAID boxes (Drobo 5’s) is that you can lose any two of the 5 drives and not lose any data. The box acts like one big hard drive as far as your computer’s concerned. But it spreads the data out across all 5 disks, so if any one (or two) go, it can still keep going while it waits for you to frantically run out to the store and get a new drive to slot into the place of the blown one. Once you give it a new (healthy) drive to use, it spreads everything back out, and you’re doubly redundant again.
This matters to me because I’ve somehow managed to toast three hard drives in the last month. One was part of RAID 1, and it was a complete non-issue. Pull old one, bash with hammer, throw in trash. Slot in new one, and we’re back. Total time, about an hour, counting the trip to Fry’s.
The other two were non-RAIDed working drives. One was a total loss, but I had most of the data elsewhere, I just need to reconstruct it. The other died slowly, so that I could salvage about 99% of the data.
For the moment, I still prefer spinning drives: (A) they’re much cheaper, byte-for-byte, and (B) when they do die, a lot of the time, they’re salvageable, or at least they give some warning. SDD’s just croak. Fine one minute, and stone dead the next. No salvage, no warning.
When you’ve got many Tb of graphics backup the way I do, having redundant SDD’s would be spectacularly expensive.
That said, I also have an offsite (Cloud-ish) backup service. It’s not really “cloud” but it is an internet based offsite backup. I use crashplan.com, because they have an unlimited plan that’s not too expensive. (Many Tb. Much more than you’ll get with Dropbox or others. )
The most important part of it is that the backup is encrypted. Heavily encrypted, with a local key. The data stream doesn’t leave my computer until encrypted, and crashplan doesn’t have the key. So even if they get hacked, they can’t give up the key they don’t have.
Back up early, back up often, back up redundantly.
Just by way of example: I once lost 50 Gb of personal pictures. I burned them all to blue-ray DVD’s. I even burned three duplicate copies of each disk. Did a byte-by-byte comparison with the source data on all disks before I deleted the source. And about 6 months later, the media went sour. All the disks, all the copies. Poof. Because it was the same batch of media.
So now, I also make a habit of populating the HD’s in my RAID boxes with drives from different manufacturers, installed at different points (months apart). Because what normally happens with a RAID box is that you buy the box, and 5 identical drives to go into it, all at the same time. Which means that they all get to the end of their lifespans at about the same time. So you suddenly lose several in a hurry, which can cause problems. Not so much if you spread out the install times, and make sure they’re different manufacturers.