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I sort of understand still selling CF cards. They were used in high end photo and video equipment until not too long ago, and they have storage space comparable with smaller SD cards and USB drives. Plenty of equipment using CF is still perfectly good and still worth using.
I’ve never heard of a zip card. If you mean the old zip disks (I think the largest was 250MB or so), I can’t imagine any reason someone would ever use one of these. Even new, zip drives were notoriously unreliable and not all that widespread. I had one, and I rarely used it in favor of CD-R or RW.
I really wish there was a viable alternative for physical backups. Blu-ray just doesn’t have enough storage space, tape is expensive, and hard drives need to be periodically read.
I’ve read about holographic WORM media, but I just don’t think there’s enough consumer demand for the hardware and media to ever be as affordable as blu-ray.
Once upon a time, I could back up all my important data to a stack of DVD-Rs. How am I supposed to back up a 100TB NAS, though? The “best” alternative is to build a second NAS for backup, but that’s approaching tape drive levels of cost.