I started off reviewing the thread you reference, in fact I posted to that same thread as well with no responses received so thought I would start a new thread and see if I could find any more help.
If anyone has any thoughts here I'd really appreciate it. After applying the most recent updates I am still seeing the same error.
Even after the most recent update to Lightroom 2015.12 I am still getting the same error. Would still appreciate any help here.
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I have exactly the same problem. Since a couple of click on OK allowed me to complete the backup (apparently w/o problems) I postponed further investigations. But last time I tried to back up my catalog the error screen appeared again and again forever and I had to kill lightroom application using the task manager (w/o a valid backup I guess).
It seems that disabling ALL plugins solve the problem, but I am not not sure yet if the cause is really related to one or more plug-in(s) or it's just a coincidence.
Sorry, I need to perform more tests to find out if this can really solve the problem.