If you want to monitor your backups, you can simply grep for ^ERROR and / or ^WARNING in the log files. The start of a program (which writes log files) typically starts with a BEGIN message in the log and ends with an END message if there were no errors which lead to an immediate end of the program.

If you are monitoring your systems with Nagios or Icinga, you can use a plugin from

Heinz-Josef Claes 2014-04-20