It is good to know about protection bits but not so important IMHO. At least the s bit (script bit). For example if you use an editor that don`t care about already existing s bit. So after saving it is lost and you have set it manually. I found it simpler to just use "execute <scriptfile>" (should work always).
In case of Copy command QUIET hides copy dialog output (file names that will be copy). So if you don`t want to see what happens then you might use QUIET. Just try it with and without. Used in a script started via icon (iconx) you won`t see output if no error happens. QUIET is primary used when copy a lot of files from/to HD/Ram because the output is too fast for reading and can slowdown copy process.
More information you can find in your Amiga DOS manual.
If you start DOS Games from floppy disk they contain S:Startup-Sequence to launch the game. If you add your copy command line to the end of this S:Startup-Sequence you don`t need an extra script for backup.
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