@mefyandell
Canvas documentation says the maximum export is 50 GB. Did you mean that you couldn't import it since it was more than 500 MB or that you couldn't export it since it was more then 500 MB? If you can export it, I would go ahead and export the whole content and download it just so you have a copy of it.
I like the approach that Nick ( @nwilson7 ) suggested about splitting it up into multiple exports. It's not the modules themselves that are giving you issues. Modules are essentially links to other content, which means that the space required for a module itself is small. It's the content that the modules link to -- most likely files -- that are going to be the problem.
However, what you could do is go into a sandbox course (if you are allowed) and import half of the content from the course and then do an export. Then reset the sandbox and import the other half of the course and then do a second export.
The ability to control what is exported is limited, but the ability to control what is imported allows granularity down to individual items. Picking half the modules works well.
Copying the entire course and then deleting modules may not work for you. Deleting the modules won't delete the files that go along with them and the files could be embedded in pages so they wouldn't get removed from the Files anyway.
Although Nick's suggestion gives direction, what I would suggest is looking for huge files and seeing if you can offload the content to a site external to Canvas so it doesn't get included in the course copy. In particular, if you uploaded video files directly into Canvas, this is a good time to put them on a free video-sharing site (like YouTube) and then embed them into Canvas. You can go to the course Files menu and look for large files that might be causing the problem.
Videos and publisher content like PowerPoints tend to take up a lot of space. Most faculty don't have that much content on their own inside a course. Those items could be stored elsewhere or at least saved to your computer outside the course export and then manually uploaded. The problem is that they would have to be relinked.
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