I recently installed the update to my Acronis 2016. A couple of times now I have unplugged the external hard drive so it was not available to do the backup, which caused Acronis to retry the backup continuously, sending me an email every 9 minutes (78 emails). The first time this happened, the error handling settings did not have "Repeat attempt if a backup fails" ticked. So, I changed the settings to repeat the attempt 1x. Didn't help.
If one clicks on the question mark for error handling, it indicates for "Repeat attempt if a backup fails" that "This option is not available, when you backup up your data to a USB flash drive or USB hard drive. I am backing up to a USB hard drive, so logic would say that repeat attempts are not available, but this doesn't seem to be the case.
I bought new larger external hard drives because Acronis refused to delete older backups to make room for a new backup, and this was happening then, although the repeated attempts were not as frequent.
Is there any way to prevent this from happening in the future, besides the obvious one of making sure the external hard drives are plugged in? I'd be much happier if the backup would just fail, then try again at the next scheduled time!!!