When saving your projects, make sure that you label them clearly so you can recall their specificities. You can also use folders to organize different projects and versions of songs. Here’s an example of how I often label my tracking projects:
Secondly, be careful not to over-compress any of your tracks and, in particular, not to add heavy compression, limiting, or maximizing plug-ins on your master output channel. Leave the master compression adjustments for your mastering engineer, just like Joe Lambert says in the above video. Make sure to set all your volume faders to keep everything “under the red” so you avoid any clipping distortion.