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You have a timeout issue. No problem, it's easy to work around! You need to use a smaller part size for split archives. For what, why and how please read the cloud backup basic configuration in our documentation. I think that a part size between 5 and 10Mb would work best on your site.

As I said you have a timeout error uploading the backup archive. 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.

So, what you need to do is change the Part Size for Split Archives to a file size which will let your server transfer each backup part in a reasonable amount of time, i.e. in time less than PHP's timeout limit. That's what I told you before and what you can read in the page I linked you to.

Furthermore, please note that the backup is already complete before it is uploaded to iDriveSync. The only question is: did the backup upload successfully? Compare the file sizes on your server and iDriveSync to find out. If they are different, the upload failed. Finally, when the upload results in a timeout the locally stored backup archive files will not be automatically removed and any quotas (file size, file count, per day etc) will NOT be applied since PHP has crashed before the code for these features had the chance to run.

Recap: you need to change the Part Size for Split Archives. Read the link I provided in my previous reply to understand why instead of asking me all over again what I've already answered :)

You're welcome :)