Amazon Glacier for stuff that can't be redownloaded or reproduced - personal photos and videos, mostly. Time Machine for documents and projects - those usually

Amazon Glacier for stuff that can't be redownloaded or reproduced - personal photos and videos, mostly. Time Machine for documents and projects - those usually live in Dropbox or Github/Bitbucket as well. I don't bother with backing up OS/configuration, since it takes no more than a day to get a clean OS and applications to a state where I'm feeling at home.