"How much better it would be if you compress or deduplicate the JPEGs, the MPEGs and the other files"
I read this sentence and knew the author was evangelizing. Anyone respectible to listen to about hard drives and disk usage wouldn't remotely suggest that MPEGs and JPEGs can be compressed (more).
Not to mention thinking 1TB of flash on a portable (read: losable) device, not to mention the "closed" nature of the device in question... does it even support generic-file drag-and-drop (ie: for an Acronis disk image file)? Well, since we're (the author at least is) in Apple land, that may not matter...
As robust as flash may be compared to spindles, one also has to consider the root reason of why corporations are still using even-less-reliable-than-disk tape drives: Because the medium is cheap and can store terabytes of data. Likewise, hard drives are still cheaper than flash and thus will still be used as a primary means of data backup over more expensive alternatives.
RAID1 is still a great means of data protection. All the data is easily recoverable (even in event of a controller failure) since it's simply a disk image. RAID0+1 and RAID5 is where the disk layout starts to get convoluted and, especially in RAID5, compute-intensive. For a performance redundant space, RAID0+1 is a great way to go. Want an even better alternative? Set up a cascading backup so your data is stored in 2 or 3 completely seperate systems, one of which preferrably being offsite. Then, your house can burn down or lightning fry your electronics and your spare backup server at your friend's house (or your Mozy drive in the cloud, if you wanted to rent that much space) is still safe and sound.