I do not need a solution (just sharing information)
I have been having problems with my exchange backup for the last 2 weeks now. I have been getting error E0000821 and E000035E. The last 2 nights, I have been stuck with updating catalogs status. I cancelled it yesterday. Today, it has been going on now for 13 hours and the byte count has been stuck at 95,854,635,012 for more than an hour now. Everyday, it takes me a couple of hours trying to troubleshoot this backup issue.
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