(1) Huma was afraid that Hillary would send Huma up the river to save herself and Huma decided to save some of the email evidence to protect herself. This done in the knowledge that Hillary would try to destroy evidence against herself using something like Bleach Bit.
Or
(2) Huma was saving the emails to give the intel contained on them to the Muslim Brotherhood.
(1) AND (2)
(1) AND (2)