Is there's a way to download all my scripts automatically at night ?

Probably check the SDF channel. Although it sounds like you might be looking for a devops solution? There's a devops channel too.

definitely second using SDF for this. you'll need some tool to initiate the download on a schedule, and ideally commit the file to a code repository if you have one set up, for change tracking.

You should be using a repo outside of netsuite that has all of your code like a github or bitbucket. That will eliminate this all together unless you have a bunch of random people in there developing and not using the same repo.

I normally just print out my scripts and put them in binders