Run this in a separate cell in one of the notebooks:
!tar cvfz zipname.tar.gz *
To span more folders up the tree, write ../ before * for each step up the directory.
tar cvfz zipname.tar.gz ../../*
The zipname.tar.gz file will be saved in the same folder as your notebook.
Also, if the file size is too large, follow these steps in the same block of notepad
!split -b 200m allfiles.tar.gz allfiles.tar.gz.part
Alternatively you can use this extension https://github.com/data-8/nbzip
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