1. Create whatever sub-folders you want under the main Library folder.
2. Drag and drop the files you don't want permanent on the unit into the library folders.
3. Delete everything that a) isn't permanent, or b) is stored in a Library folder.
YES: As long as a file (rig) is in a Library folder it is not 'gone' if deleted from the unit.
Backup rig manager often the same you do with the unit.
If you're using Rig Manager be sure to let the program and the unit update as you go. If you are working with a number of files it can take
a few seconds before everything is processed. Watch the green progress bar at the bottom of RM.
I've locked up RM a number of times by simple going to fast and tripping the program.