Anticipating a crash on a 13" 2012 MBP, running 10.10... In disk utility, what's the qualitative difference between backing up files with a disk image, versus restoring to an external drive? From what I can tell, it looks like the only option I have for the disk image is to copy the entire volume, versus restoring where I can copy individual folders, but have to erase the contents of the external drive while doing so... Will both have relatively the same effect in a new environment? Like, either way the files are saved? THANK you.