The problem, which occurs is similar to backup with log truncation.
The error show reads like :
//------------------------------
I. 2009-08-18 08:31:39. Log scan starting at offset XXXXX
E. 2009-08-18 08:31:39. Unable to find log offset XXXXX
E. 2009-08-18 08:31:39. Upload aborted at offset XXXXXX
//------------------------------
