Go to your Pictures folder, find the iPhoto Library file, and back that up to whatever media you wish. That contains everything you need to backup for iPhoto.
Go to your Pictures folder, find the iPhoto Library file, and back that up to whatever media you wish. That contains everything you need to backup for iPhoto.
The iPhoto Library looks like a special kind of Mac-only file, but it's only a Folder that OS X displays in Finder like a single file.
You can drag iPhoto Library to a Windows drive (or mount it in Windows via Samba if you share it) and you'll be able to navigate through the directories as normal. You would have iPhoto-specific files in there, but the Originals folder contains all the original photos in event-specific folders, and they are just standard jpgs or whatever picture type your camera(s) use(s).