Description of my issue:
Akeeba Backup [Professional] v4.1.1 gets stuck at 83% completion in Post-processing on a new localhost site. The problem appears to be specific to uploading backup archives to DropBox — with Post-processing engine set to "No post-processing," the backup completes without issue every single time.
I have numerous Hostgator-hosted sites which consistently upload their backup archives successfully to the same DropBox account with the exact same credentials — which leads me to believe that the problem I'm experiencing has everything to do with my OSx Yosemite-native AMPstack localhost configuration. But because everything else appears to be working just fine with my Joomla installation, I don't know where to look.
My log file is some 7.3MB (available for download here) and does indicate one warning:
Post-processing engine and archive part size
A post-processing engine is found, but no part size is set; this could lead to timeout issues
Set a part size inside backup profile configuration.
I have varied my Chunk size (which I presume is what is referred to generally in the related tickets I've read as Part size) setting between 5.00MB and 20.00MB, to no avail. I have to believe there's a resolution-in-waiting lurking in that brilliant mind of yours