A weird problem, I'm unable to create backup as Snapshot Pro says "GZip not activated" under requirements so can't proceed to the next step, see this.
But at the same time, I checked the GZip module is enabled under apache2/mods-enabled and your own plugin Hummingbird (my fav) confirms the same as well! See this.
So, how is Snapshot not able to understand the same, 'coz except for that all other plugins get it enabled snapshot is the only one throwing me errors, how am I supposed to backup my multisite in that case?
P.S.: I have enabled Support Access from my website for WPMU Dev to see what's goin' on, so do access that too and please lemme know ASAP!