Your best bet is to capture a Console Log ( Chrome , Firefox ) and use it to file a Help Center Request , then, and get dev eyes on it. Usually when a backup or restore fails, it means that the campaign is too large and times out, but in my experience it has to be phenomenally large these days. Good luck, and if support does manage to solve your problem, could you post back here and let us know if there was anything that you as an end user could do to solve the problem (in case others with the same issue come across this thread)