Snapshot failing to complete backup

Simple problem, with a probable big fix. Snapshot (just installed) on http://blog.dredgecycle.com is failing around 2/3 of the way through the backup process. I've excluded tables (which I'd just delete if I knew how to target them in the database), and watched the immediate backup process—it either fails within a few minutes, or hangs indefinitely.

I've also increased the plugin's memory limit up to 160MB, though it never seems to peak above 71MB.

Seems similar to what was happening in this post: https://premium.wpmudev.org/forums/topic/snapshots-not-creating-snapshots-on-run

Happy to supply login info, and it'd be super-swell if @Paul were available to work on it, as he made short work of the last problem.

Thanks!