I had the same problem on some websites and finally resolved it (with no help from the author of the program) this way: I changed the backup time from something like 3 AM to something before midnight like 11 PM. It seems that in order to run the backup, the site must have been visited by human or machine at some point during that calendar day; so my 3 AM backup was not working reliably. Once it hit a point where it would not back up on a given day, it would just hang forever and not make another one. Since I changed the backup time to before midnight, it works as advertised. Sure wish the authors would put this info into some kind of FAQ or something!
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