I posted this in my other thread but got no reply, so i'm reposting it here...
It appears that there is now a LARGE (12.5 MB) "sdk" sub-folder in the BackWPup plugin folder. The previous 2.x version did not have this "sdk" sub-folder. This may be part of the problem. Maybe the zip backups are reaching a limit and timing out. The sdk sub-folder makes the Backwpup plugin folder the largest folder in my site.
Why the large SDK sub-folder in the Backwpup plugin??? This plugin is now larger than Jetpack and any other plugin I have.
Also, after upgrading to 3.0.4 from 3.0.3 and from 2.x the zip format still doesn't finish. it gets stuck at about 75% zipping, and doesn't finish. So 3.0.4 is still not working.
i tried the tar format and yes it finishes, but it took a LOT LONGER than what backupup 2.x used to take, and it doesn't appear to do any compression. The "packed" size of the sub-folders inside the Tar file were actually LARGER than the sub-folders themselves. So Tar is definitely not an alternative.
Please reply. Many of us are hoping you can fix this soon or go back to the old version. Thank you.