Matt. "Another red herring... Why are you wasting backup space and time backing up a cache? By it's very definition it is not something that needs to be backed up. You have spend a considerable amount of time here trying to fix a backup of something that seriously should not be backed up. Clearly you have no concern with the fact the code is on your system as the solution you have found is to delete it so your backup runs without error. Not identify the source and eliminate it from the server." I am obviously in way over my head here, just trying to be helpful. Getting lots of feedback from this thread and much more from community@connect.mozilla.com. Spent some time last night upgrading the Compal from Win7 to Win10. Lots of fiddling left to be done there, so I'm going to leave this discussion to those of you who actually know what you're doing. Will monitor for more developments. Thanks for being here and for helping those of us who know just enough to get into trouble, but also when to yield the floor to the real experts. You folks are the best. greg