I keep having issues with error messages followed by a message that backup was successful. For example, yesterday I did a backup, started manually, and when it was verifying I got an error message that it could not verify and said it might be caused by "poor media quality." (unfortunately I did not screen shot that message) I had two choices, retry or cancel. I tired retry a couple of times just to get the error message again. I came back this morning to see what happened and imagine my surprise to see that the program shows that it successfully validated last night.
So, I opened the log file and as far as I can tell it has a few errors but never successfully validated.
This issue, a backup that creates error messages but the summary shows it successfully validating, seems to happen to me repeatedly and makes me afraid that my backups may not be valid.