I organize by folders and just copy the folder if I'm going to work on a project on my laptop.
I have two back up HDDs in my work station, one drive I back up the working folders to everyday from the primary SSD, and one drive that I mirror the primary drive to once a month (unless there's a major software change, then I do it immediately). I also have a external SSD that I mirror the primary drive to if I'm going on a trip so I essentially take the work station with me, so I never worry if I have forgot a file, etc.
The nice thing about mirroring the primary drive is if the computer primary drive craters, or something happens to the computer, I just stick my mirrored backup in place of the failed drive, or a new computer and I'm off and running just like nothing happened. I started mirroring drives back when I was a mechanical designer. Every couple of years the company would get new computers for the engineering department. It was very time consuming to reinstall software, etc. It would take a day, sometimes two if something didn't install or activate properly. That's not a problem with a mirrored drive.