Hi,
In the log, it says:
0019.602 (0) Binary zip: error (code: 9 - look it up in the Diagnostics section of the zip manual at http://www.info-zip.org/mans/zip.html for interpretation... and also check that your hosting account quota is not full)
That URL says that error code 9 means:
9 - the user aborted zip prematurely with control-C (or similar)
So, someone killed the zip process - either manually, or perhaps there is something automated on your server that does that.
If you're not sure how to prevent that, then switch to a different zip engine by adding this to your wp-config.php:
define('UPDRAFTPLUS_NO_BINZIP', true);
Best wishes,
David