It is up to you to archive any old D2L content, and especially content from courses and Dev courses that you only teach once in a while (and might have forgotten about). DOIT will NOT be keeping a backup of D2L content, so it’s really important that you archive anything that you want to save. There will be no way to retrieve any content from D2L after it goes dark in December, so please archive your course content.
From inside your course in D2L:
Edit Course -> Import/Export/Copy Components -> Export Components (make sure “Include course files in the export package” is checked) -> Start -> Select All Components -> Continue -> Continue -> Finish -> Click here to download the export Zip package -> Save it somewhere on your local computer