Kraftsims
Are you sure you want to 'Sync'? While backing up is Syncing in one direction, I think it's best to clarify the terms.
Backing up is copying from a Master Folder to a Slave Folder, as in from your iPhoto Library Folder to your Back Up location. Syncing can mean making sure that the same files are in both locations and can mean copying in both directions.
So, for instance, if you delete files from iPhoto, they will still be in your back up. If you perform a Back up, the unwanted files will be removed from your Back up, if you Sync them, the unwanted files will be returned to your iPhoto Library Folder.
So, do you want to Sync or Back Up?
There are many, many back up utilities for the Mac. Search on
Macupdate. Personally, I use
DejaVu.
The best way to test
any back up app is to do a trial restore from time to time.
As to copying to DVD. There are two options. By exporting the files to the Desktop and burning them from there you get the latest version of the pics. Choosing which pics to back up? Well yearly is as good a way as any. The advantage is that you get the pics, nothing else.
Using the Share -> Burn command, means you get a version that can be read in iPhoto, including Originals, Modifieds, Thumbnails etc. It does take up more space, but when you insert the DVD it shows up in iPhoto as files can easily be brought back to the running library.
Regards
TD