Sorry.... should have been more clear. Some people will resize a photo, so the newly sized image is a duplicate of the original. Or they will make a second (third, and fourth) copy because the image should be filed in several different places. Those kinds of duplicates. Some people make a lot of those, and some people don't. So I was asking if you did or not.
Lots of backups.... of the images.
So the image folders were being backed up to the on and off-site spots... but not the iPhoto library? Even with your system, I strongly recommend getting a copy of the iPhoto library. The database in it is the most vulnerable part, and the key to everything. I've now moved to Lightroom, but I have the whole system being backed up to a Time Machine. Plus I make nightly cloned copies of the photos (inside Lightroom) including the database. Plus I have Lightroom make daily backups of the database over to the system disk, which is also being backed up by Time Machine and nightly cloned backup. It's the catalogue that is key. That is 5 copies of the catalogue... not counting the off-site backups.
Yeah - Time Machine can be very convenient.... but I don't rely on it.
My present backup strategy wasn't in place when I lost my 67 GB iPhoto library. Losing it was no big deal, really. The darn thing was so slow it was useless. But losing did cause me to upgrade my backup strategy.
My whole machine goes to Time Machine on an external drive connected to a 500 GB Time Capsule (which has been replaced once by Apple under warranty with total loss of my daughter's data).
My photos go to an external firewire drive as well as to two NAS drives and the ones I really want to keep go to either flickr, picasa or smugmug. They once went to MobileMe but we all know how that turned out.
I recently decided I needed yet another backup strategy. This one doesn't rely on the internet. I'm working on getting some USB drives I can CCC my HDD (or at least certain "important folders" to and leave them off site (possibly at a friend's house, safe deposit, or even my desk at work). I'd like to put the "extra special" stuff there like tax returns, scanned documents, college transcripts, offers of employment, vital records, etc. Perhaps I'll expand to include templates for common documents I maintain such as newsletters.
I just picked up an SSD for my Macbook so I guess backup of rotating media isn't the main thing. I'm just very cautious about my data.
I don't consider the iPhoto library to be of much value. I can import the events again (again disabling copy of originals to iPhoto Library), and let it run faces and places overnight and it's all back again. BTW, I don't use iPhoto to touch up my photos. I use Gimp, Seashore or PhotoFX. So the modified photos live in my folder structure.
I've been thinking about Aperture. I can't allow another Adobe product on my Mac unless I really need it. Dreamweaver with all its activation DRM was terrible. Most recently I spent close to an hour on the phone with Adobe support over failed activation of a piece of software that's been sitting in my Applications volder unused since 2009. Finally they gave up and told me I needed to shell out close to five hundred bucks for the current version to run it on Snow Leopard. No thanks. I'll fire up my old G4 if I need Dreamweaver. Maybe someday I might get Illustrator or Photoshop but never anything else from Adobe-land especially not acrobat reader or any sort of flash. When I watch a movie in html5, my fans start running. When I click the puzzle piece in chrome to allow flash to run, my fans start running even when it isn't playing a movie. Yuck.