I reduced Sony raws by 50% (lossless)

There are electron apps for demo. But basically, using the right compression, you can reduce disk requirements. Mine is like 4TB, so it is useful. Oh, it is lossless, so you can get back your ARW back. It also treated like a regular JPEG image, because compressed matrix data is in the tail of the file, and builtin JPEG is shown first.

Tested with a7riii