Most likely you will not even be able to run a local backup on your server. But 
you can try it from the command line with added verbosity. Hopefully you will 
receive more detailed info.

If this is a rather fresh scenario, i would suggest a reinstall.
Otherwise you can try the new NetWorker Health Check Tool (HCT), which is 
available on request from EMC support. It helped me recently in a bunch of 
similar issues.

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