I have put 2 files on Dropbox. The latest is from the failed attempt from my staging site, the older is the latest failed attempt from my main site. I have not been able to make a backup since around August 6th.
I have adjusted the archive split on both to 25MB. My host has adjusted the max_execution_timeout to 900s, the vars to 10,000 and the Php meory to 512 on my main site. I am using Updraft Vault for storage.