most of my Zip cartridges are solid (I have a lot of them), they haven't left my house ever and my house has a gnarly old aluminum roof that damn near kills all cell reception in the house =P but I hear ya on even solar flares killing unshielded magnetic media. but so far no clicks of death from any of the disks. I'm not using them for backup anyway, more of a faster means of just swapping from one PB to the other, then offloading them via FTP to my Windows box and just store/use the files/apps with Basilisk

I reiterate: SCSI Disk Mode is where it's at! If you have a desktop or a working PB with a CD-ROM burner, hook the target system up to the ROM Burner equipped Mac in SCSI Disk Mode and then back up to CD as you would from any other HDD installed inside/connected to the Burner equipped Mac!
With the right cables/adapter/passthru termination, you can do all sorts of neat tricks to save time, effort & cost! [] ]'>

And have far more reliable backups on CD!

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only working Macs I have are a 520 and a 520c PB, and one AAUI transponder and one Zip drive. so this is really my only option. another reason why I wish I hadn't of ditched my 840AV because I had a SCSI internal Plextor burner in it.