The larger issue is not backing up. The larger issue is the idea of "fair use." For decades--centuries, even--there were rules about what was protected and what was public domain.
That all ended today:
* The Supreme Court gave Congress the ability to take works OUT OF the public domain and put them BACK INTO copyright.
* The president reversed his support for SOPA and PIPA--who knows where he stands now?
* The Justice Department moved in on Megaupload, treating them like the 2012 version of the Mafia.
There no longer is a public domain.