Managed Backup Issue

I am having an issue with managed backups failing for the I have other tickets where I was having this issue with a different site, and we finally got it all straightened out. I had needed a tier 2 tech to help me get it straightened out. We have changed many server settings and I am still having an issue.

It is a big site, but we have excluded the folder that has over 20,000 images in it and the site is still not backing up.