Oh damn... I over looked he wanted to use them for backups. Yeah I woulden't do that: It'll get expensive... fast and flash drives, over time, can be unreliable.
For this I'd buy a good quality RAID enclosure and mirror 2 hard disks, of same size, from different manufactures, powered on a line-conditioning UPS. I have a buddy that has about 7-8 external drives powered all thru his UPS all these years and NOT ONE has failed. A lot of hard drives failures can be contributed to power issues.
Hitachi hard disks are good in my opinion. I'd probably mirror to a Hitachi and Samsung.
If you can afford it, tape backups are still the most reliable media IMO and can now hold [from what I've seen] up to 800 GB uncompressed data on a single tape and support encryption.
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