Greetings,
I cannot comment on the overall integrity of your cards. The cards need to be CFExpress type B, the SD cards should be UHS-II v90's. You can use lesser performing cards in some situations, but I wouldn't.
My card brands of choice are AngelBird, SanDisk and ProGrade. I think Delkin is a good brand. Buy your cards from a reputable source, not Amazon. CFExpressB and UHS-II v90 cards are not inexpensive. I get it. I don't think any of my cards are bigger than 512GB. Its better to go with quality over quantity.
Card readers. Pick a good one and go with one. You don't have to buy a vendor specific reader for each brand, but with CFExpressB some vendors offer little "extras" like FW upgrades and optimization algorithms that you can't apply or use unless you have "their" reader. I have a Prograde reader that does CFExpressB and SD UHS-II. Its plenty fast, compact and lives in my travel bag.
Card swaps and downloading images. It took me a while to figure this out. Here's what I mean. I have my camera set to record video to card1 (CFExpressB) and Images to card2 (SD). They operate as singles. If I take card 2 out of my camera to download photos and shut the memory slot door, my camera is now recording everything to card1. Even if I re-insert card2. What's the trick... don't close the memory slot door while the card is out of the camera. As soon as you close the door, the camera says.. card1 is my new target for images. So in this configuration, be mindful of this. As long as I don't close the door, the camera picks right up where it left off.
Renaming folders and more. Don't. If you do this outside of what the camera allows in its menus, you are going to lose images. The camera creates the file system. It knows where its saving and what numbering scheme to use. Don't change this on your computer, adding folders, renaming or changing image numbers so it starts where you want instead of where the camera knows it should be. You'll lose images. I keep 2-3 copies of my images when I travel. Cumulative - running master on my card, daily copies of anything shot on my laptop and a 3rd on a USB stick or other SD cards. Chance of loosing all 3 pretty much zero. Even better option, carry 1-2 cards more than you might think you'd need. Switch them out, mid day, after shooting something important, etc.
Formatting cards. Always do this in the camera. Very rarely would you need to format a card on your PC or MAC. Maybe if it were corrupt or damaged and you had recovered files from it. Then maybe a low level format, but I'd still re-format it in camera afterwards. Formatting in camera is always the best choice. Happy card = happy images = happy photographer.
If you have any cards that exhibit unexplainable data loss and you have not done one of the things mentioned above, put a small piece of blue tape or x on it. Its now suspect until such time you have confirmed its health and integrity. Do not trust it for once in a life time trips, family gatherings, etc.
The key to success is being prepared, being systematic and minimizing risk. Take from this what works best for your shooting situations. Hope it helps. 😀 Others here will have more to add I'm sure.
~Rick
Bay Area - CA
~R5 C (1.0.9.1) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, ~RF 200-800 +RF 1.4x TC, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve Studio ~ImageClass MF644Cdw/MF656Cdw ~Pixel 8 ~CarePaks Are Worth It
