I'm new to Poser but found myself making a folder for each thing I was working on, and saved my files in it as I worked. I did that for each project I started. I found it ate up too much disk space so I went and deleted them all. Now I don't bother. I save files until I'm done with what I'm working on, and then delete them. I don't like clutter on my computer and tend to go through the hard drive on a weekly basis to get rid of stuff that I am not using.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi