Support

First please set the part size for split archives to something higher. I'd recommend using 100Mb for now.

What we probably need to modify for the backup to work is the fine tuning settings. Please try setting the minimum execution time to 1 second, maximum execution time 20 seconds and execution time bias to 75%. These are the regular, fast backup settings. We need to establish whether the server can support full speed backups.

If this doesn't work please save the log file of the previous backup run and try minimum execution time 5 seconds, maximum execution time 3 seconds (yes, the max is less than min, this is NOT a typo, it's intentional) and execution time bias to 50%.

If this still doesn't work please ZIP and attach the log files from both runs in your next reply. Also, check that you have enough disk space for the site and the backup. Since most of your site is non-compressible videos you need to have about 50% of your disk space free for a backup to be possible.