I am working on getting a camera, and apologize for not having personally tried this with any raw footage, but anyone wanting to store the raw files may want to consider using Adobe's new lossy dng format. I use it to store my "B" photos and it saves a considerable amount of space while retaining most of the flexibility of the raw file. Of course you will be locked into the Adobe ecosystem and it would add an additional conversion step. As usual, thanks to the awesome ML contributors!