A FLEXIBLE external enclosure, rather than one of these sealed external enclosures, would better suit many people.
For backups, one wants to store backups off-site.
Five years ago, for my home backups,
I took these external enclosures to my office for safe keeping.
However, these external enclosures are far bigger than just their internal SATA disk drives, and each additional external enclosure adds cost.
I could hardly fit most external enclosures in my brief case,
and then I could only carry them awkwardly.
Now I just carry the bare SATA disk drive in my brief case,
slipping the drive into a bubble lined 6" x 8" post office mailer,
and sometimes inserting an anti-static pouch.
Hours searching for a commercial product protecting bare disk drives turned up no such products -- do so few people carry their backups between office and home?
At home, I slip the SATA disk drive into the external enclosure
Rosewill RX-358 SATA to USB with 80mm fan.
These Rosewill's have no flexible SATA connector
-- you lay the drive into the Rosewill, then slide it into the SATA/power connector (very well designed).
I merely lay the cover over the Rosewill connection,
since I weekly extra the raw SATA drive for offsite storage at my office.
I have only seen these Rosewill enclosures at
http://newegg.com
With these backups, I use the 2 platter Seagate 500GB 7200.11
disk drive, model ST3500320AS, for about $120.
I use 3 such disk drives on each Rosewill enclosure,
keeping 2 drives at my office, and one drive actively backing-up at home.
Additionally, I don't believe one should use backup software that comes with the mentioned external enclosures.
This violates parsimony.
Virtually everyone already has backup software on their computers,
so why patch in Frankenstein backup software for each different external drive.
I might be somewhat naive here,
since I use one of Linux many backup software,
running it daily within my own bash shell program.
Like Microsoft's backup, I use a Linux backup that creates one huge file (eg, 21GB) for each backup, although I consider incremental backups.
I can get about 20 full backups on each 500GB disk drive.