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One other suggestion - be diligent about keeping a local copy of your contributed content. Be organized as possible. This is likely the best current option.
@user553702 so true, it should not be hard - especially when the student does not have the option to choose the application. All I can say is to try to contact the head of the online learning management systems at the school. You might find a kindred spirit who might be able to extract and provide the data to you. Also, you should look into the various interchange formats for Learning Management Systems - for example: Check out this company, the founder is very dedicated to data interchange for LMS systems scorm.com/scorm-explained/one-minute-scorm-overview