The MPAA has a clear opinion about uploading your ripped content, even to someone who doesn't give it to somebody else. The MPAA would still say both copies of The Dark Knight are illegal. (Note that this is not exactly what assistantpilot said; I tweaked it on purpose since I can be more definitive, and it's relevant to the original link. You are also free to disagree with their assessment. I do, but I wouldn't care to argue it in court.)

However, the poor choice of example doesn't negate the underlying point. Bits don't have color [1], and in general just because Alice shouldn't have a file in her cloud file store doesn't mean that there is nobody who does have the right to put the exact same file in the cloud store. There's no way to tell.

In some ways that's the worst part of SOPA from a philosophical point of view.... what the law essentially demands isn't even possible. It is not possible for Google to look at a file and tell if it is legal or not. They can make some guesses, but on Internet scale they can't know, yet the law requires them to know, then act, or face the consequences. This is not possible, neither in theory nor in practice. Laws that require the impossible are just obscured tyranny.

[1]: http://ansuz.sooke.bc.ca/entry/23

That article is about a guy who shared legally ripped music over the Internet. Big difference. I don't think this is as legally fuzzy a topic as you make it sound.

a similar article made me think if I ever owe any digital audio whether from my own CDs or from internet, I would have stored it on encrypted drive, preferably encrypted with more than one encrypting algorithm, and either download from work/starbucks etc, or at least owe wireless router so if they go after me, I could claim someone was using my wireless router without my knowledge. I could just hope case against me wouldnt be that strong that they would weight between me giving out a key to my hard drive and lets say 15 hard years in jail.

EDIT: and then in court I would say I forgot the password because I havent been using this drive for a while now.