Hi,
I can see from the log file that the web server provides too low resources to allow larger zip files to be manipulated in the time it makes available. You can make the backup succeed by doing this:
1) Go to the UpdraftPlus settings tab
2) Scroll to the bottom, and open the 'expert' section
3) Reduce the 'split' size down to 25Mb, and then save the settings
Then start a fresh backup.
Best wishes,
David
