Yes, that was what I was afraid of.
Your host is imposing very low limits on CPU usage: if you exceeding them, you get temporary blocked.
Now, let's start to tweak your configuration to optimize everything. Please try these suggestions one by one, if they work, there's no need to apply the next one. That's because every change will make your backup process slower (so it will require fewer resources), but let's try to avoid making it dead slow.
- Exclude folders wp-content/uploads/cache and wp-content/cache from the backup. Looking at the logs, there's only temporary data, which we can safely ignore.
- Double check that the Site Engine Scanner is set to Large site scanner
- Inside the Archiver Engine settings, set the Part size option to 20Mb
- Use the following timing settings: Minimum execution time 5 seconds, Maximum execution time 3 seconds, Runtime bias 50%. Yes, minimum is greater that maximum, that's not a typo.
Give it a try and tell me if those suggestions did work for you.
Developer and Support Staff
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