Sleeping MBP using lots of network data

Somehow, even with "wake for network access" disabled and my remote backup software (Backblaze) paused, my computer transferred 5.8 GB overnight.

I did some preliminary reading on different hibernation modes and determined mine is in the default "safe sleep" 3.

So I guess my question is two-fold:

A. Which sleep mode should I actually be in to prevent such network activity?

B. How do I determine which apps/processes are transferring that much data overnight?

Thanks for your help!

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