Radtech1 wrote in post #7491751
If you have all of your backups on redundant magnetic drives (external, hot swappable, etc) and then along comes one EMP, and pfffftt, there goes all the drives at once. So even though I do use redundant drives, I still incorporate a different type of storage in my workflow: EVERYTHING goes on a hard drive that I mirror after every session. THEN, I go through my new photos, and I do a rough filter to screen for the potential keepers, which is usually 10 % of any given shoot. I back up THOSE files to an optical drive.
But I am not done yet. One house fire and there goes both the optical and magnetic. So, I have yet one more layer of backup in my workflow. Once I start editing a photo, it goes in my "Working" folder. As well as the two methods already mentioned, I ALSO backup my Working folder to MozyHome (an Internet storage service.)
Rad
If you are the recipient of an EMP, then you have more things to worry about than what happened to your pics. 
I know what you're saying, though.
OP, what you describe is not backing up, you're just transferring the pics from one source to another. I also went with Mozy, $4.95/month for unlimitied storage. It is painfully slow, however, since I'm only uploading at about 1 MB/s.
My only concern is that they could go under at any time. With the prices of HD so low, I'm almost tempted to just buy another one, but that doesn't address the offsite storage issue.
Regarding using a HD and then removing it and putting it in storage, I've heard that HD last longer if constantly spinning, that the turning off and on wears it out. I have some drives going for at least 2 years almost non-stop with no issues. Anyone have thoughts on this? Is this true, or just urban myth?