I should have clarified. I keep the PSD files also in case I need to go back. In fact, I'm terrible about creating multiple layers in Photoshop for any edits I have done as I am always worried about having to go back and redo edits. What I meant was that by having all the PSD files from the project in one folder, the program will quickly batch convert and resize jpg copies and store them in a subfolder. Sorry for not being clear.In contrast, I keep the PSD files to do further editing, often for different purposes. Usually when I keep the PSD files, they have multiple layers, sometimes including adjustment layers. So I will retain the option of changing layer masks, opacities, etc., in the reediting process. An obvious example involves output sharpening. I will use completely different layers for making files to print from those for making JPEGs. My internal SSD had over 600GB of free space, and I have several external hard drives in a Thunderbolt-connected enclosure for backups and archives. The 6TB drive has very little on it so far. It will be a long time before I'll need to worry about storage. I do trash all the work files that FCP X produces when I edit if I am sure I won't revisit the same video project.