i use a 128gb lexar compact flash in my 5dmk3, ive never had a problem with any memory card , been using dlsr's since 2005.
You've been lucky then. Don't make the mistake of thinking that because YOU haven't had trouble, there is no trouble to be had. That's like assuming that because you've never had a car crash, you're never going to have one. You've got 2 slots I've had cards fail.
Like i say, if you buy genuine decent brand, you stand more chance of being ok, than cheap and ebay fake.
2x 16gb cards, one in each slot so i have a good 600 shots available - never normally take that many shots in a day so suits me fine and if one card were to die i'd still have a 300 shot capacity left
I accidentally put a CF card through a wash cycle not so long back. Came out clean with all 32gb of data intact. Not that I recommend popping your compact flash card into the washing machine.
Surely the only sensible option is to shoot to 2 huge cards in camera, but not take either out EVER - moving them can increase the chances to corrupt
So, you need to be able to instantly wifi them to your laptop, which backs them up instantly to at least 2 external harddrives. As soon as you've done shooting, one harddrive is couriered to a secure fireproof storage facility while the laptop backs everything up to the cloud. Of course if it really matters then you also need a 2nd shooter with the same everything sat next to you shooting the same too, and backup up to their own lappy/cloud etc.
Be safe people
Of course when you get back to editing you'll still delete 90% anyway cos you shot a load of s***e
Dave
The truth is, there's no real right or wrong and lots of different ways of approaching the dilemma.
If you have dual slot camera then use big cards, otherwise small. That's about it really
If you had a Nikon D4 or D4s would you be limited to the speed of the CF card rather than the XQD card in the case of backing up?
+1Great big massive ones... in pairs, and use both card slots - set so B backs up A. I hate arsing about changing cards.
Another cock up by Nikon .LOLCamera is only as fast as the slowest card in it if you're backing up the same files to both slots. Dunno if backing up sRAW to the cf would change this.
Another cock up by Nikon .LOL