I have a seagate external hard drive arriving soon, and I was wondering about my backup options. I don't want to use 3rd party programs, just good ole drag and drop. I have two main questions: 1) What folders should I put on my external so that in the event of my internal HD failing, I can re-install OS X, drag these folders back into the new install, and have my system as it was pre-crash? *I know I should include all of the folders in my Home directory, but what else? Does it make sense to include my Applications folder? Are there any files in my Library or System folders I should backup? Where is my Mail data stored?* 2) Does it make sense to just drag and drop, or should I use a disk image? Any help is appreciated. EDIT: would it instead make more sense to make 2 partitions... one being a clone of my drive, the second for general storage?