It does that if it can match them, and uploads them if it can't. Downloads on other devices might be 256 kbps AAC either way, so not a backup service. You cann

It does that if it can match them, and uploads them if it can't. Downloads on other devices might be 256 kbps AAC either way, so not a backup service. You cannot officially force an upload, but I would expect there to be some kind of hack for it. If I remember correctly, calling the album "Red Album (sorejan's Version)" actually does the trick.