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Please ZIP and attach your raw backup log file. Without it I can't know what's going on.

You forgot to do one crucial step noted in the documentation:

We will have to change just one option: Part size for archive splitting. Drag the slider to the right, trying to set a value of 20Mb. The slider is a little too sensitive; use it to get near to the 20Mb value, then use your keyboard's right and left arrow keys in order to fine-tune the setting. This setting will chunk our backup archive into multiple files, the maximum size of each one being the value of this setting.



You might wonder why we need to do that. PHP always has a strict time limit, i.e. the maximum time a PHP page may process data before the web server aborts it. Uploading the backup archives to cloud storage takes time, the exact amount of which depends on the size of the file and the network speed. The time limit and the bandwidth are beyond our control, so we can change the only parameter we can touch in order to avoid timeouts: the file size. Akeeba Backup Professional is smart enough to upload each part of the backup archive on a PHP page load of each own, so as to avoid timing out.

FYI, Akeeba Backup 3.2 will no longer require this option as it will be supporting the new multi-part upload feature of Amazon S3.