The file naming convention appears to be <computername>.sv2i, <computername>drive<mmm>.v2i, <computername>drive<mmm>_i<nnn>.iv2i, where mmm is a sequence id of backup sets and nnn is a sequence id of incremental backups. Normally, the number mmm is incremented each time a new backup set is created. The anomaly that I observed was that after four incremental backups had been made (nnn=001, 002, 003,004), mmm changed from 053 to 046 and incremental backups continued (nnn=005, 006, 007). Coincident with this anomaly, both of my offsite backups failed, with error EC8F1F5B. The laptop on which this occurred may have gone into hibernation about this time. (Running Windows 7)
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