DevOps is applying tools to issues such as error log reports, h/w and environmental monitoring outputs and other data sources, looking to highlight things that matter amidst all the dross that modern systems churn out. It also aims to automate stuff like release processes and other repetitive but critical activities, which includes testing, backup processes and a shedload of other stuff.
Where I part company with what is a worthwhile labour saving process is when people start seeing it (and selling it) as a standalone activity. It is not any such thing, any more than ITIL is a set of fixed processes (that's ISO20000-1, and pretty much pointless outside some CS departments) rather than a working culture with a common vocabulary...