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I found the Google Music Scan/Match very odd.
I think it's based more on the meta-data than the files, and actually I should experiment with that and prove it because it would mean free albums.
The discovery I made is that I uploaded a missing album from the UK Play Music library... Ladytron's Gravity the Seducer. The version that then appeared in Play Music is an entirely different mix from the one I uploaded, and it turns out that they released different mixes for different markets and that what I got in Play Music was the US mix.
I figure that the uploaded files merely had metadata searches done, matched, and that they then de-duplicate their store by pointing my Play Music at the existing files that they have which match the metadata.
End result: You may get different files than you uploaded, and it appears to match on metadata rather than actually giving you the binary files you uploaded.
Fair enough, I can see why you'd need a lot of storage for that! I could do with more HD space and a RAID backup system but I'm currently trying to streamline my life and reduce clutter, not increase it. I have all my CDs stored in my parents loft but I will be donating [nearly] all my DVDs to a charity shop soon. I can't see the need for physical media is going to come back and I haven't watched many for years.
I wonder whether the google music scan/match thing will expand to video at some point?