As I amass more and more calibration frames, I started thinking about how 'best' to organize my calibration library.
Presently, I have three folders: darks, bias, flats. I further break those down into subfolders each of which corresponds to a fundamental property. For example, darks/-15C/1x1. Then in that folder I will eventually have a simple-named file like master_dark.fit.
The calibration frames are in a directory structure outside of where I keep my images.
How do you guys organize yours? How long do you keep calibration frames before they go 'stale?'