My advice is … “don’t try to ‘save data,’” not until the project is completely done. Your “final cut” probably should consist of a directory (or set of directories) containing thousands of per-frame, OpenEXR-format, great big(!) files. All that data, vast quantities of it, all of it exactly as generated, all of it still there. “Loss-free” from stem to stern.
Now comes the final step of producing “delivery files.” Differing frame rates, color schemes, what-have-you. All of them compressed, some of them extremely, and … “who cares, because you haven’t lost anything.” You just set up blend-files to generate each one, and fire them all off. Since it’s strictly a 2D process at this point, it’s fast. The original, big-phat, loss-free master files are still there, still untouched.
Big, fast, external disk drives are cheap. Buy as many as you need. “All that data” took time to create, and would require more time to re-produce. “Space” you’ve got. “Time” you don’t.