There is the option of converting to DNG files. Which allow for really good lossless compression. This does come at the cost of changing the file format, and ri

There is the option of converting to DNG files. Which allow for really good lossless compression. This does come at the cost of changing the file format, and risks losing metadata. That's why I personally decided to just buy more storage instead. Come to think of it, have you tried running a modern compression algorithm on the data? I don't think I did. Could be cool if combined with ZFS or similar to get the compression done transparently.