Awesome
AGClient
UC3M AulaGlobal (Moodle) from console.
Backup: Can download all files from every course into cursos/id folder.
Of course, this is Open Source, you can checkout the source code and see how secure is.
Usage
Backup all your course files:
wget https://raw.githubusercontent.com/yagop/AGClient/master/AGClient.py
python AGClient.py -u <NIA> -p <Password>
Requirements
Python (2.7) is required.
sudo apt-get install python