Thanks for reaching out with your Total Upkeep backup failure concern. Since there were no error messages to indicate what caused the process to terminate, it’s tough to say for sure exactly what caused the failure. This is normally due to exceeding some limitation on your hosting account, for example CPU usage, Execution Time Limit, or Disk I/O, although it doesn’t look like the memory limit was the issue here.

A good first step is to enable the Filelist Analysis option in the Total Upkeep > Settings > Backup Process menu. This will show you if there are any “huge” files in your website that might be using up unnecessary space in your backups. Be on the lookout for any temporary files *.tmp and delete all of those.

Also, look for any big files with:
find . -type f -size +100M and delete any of those you don’t think need to be there.

While you’re on this menu screen, also try reducing the Compression Level setting. Start with level 0, and if that succeeds try 3, and so on until you find the sweet spot. This will increase the total size of your backup archive, but reduces CPU usage and execution time.

Another tactic to try is to exclude the wp-content/uploads/ directory from your backup, since that’s normally the directory that takes up the most disk space.

Lastly you can test to see if this is some sort of caching issue. Clear all cache on your site, then deactivate WP Rocket and try running the backup without this caching plugin enabled. Temporary site cache could be causing a conflict with the backup.

I hope this helps Michael, please let us know if you have any further questions for us!