save: error, no matching devices;check storage nodes, devices or pools

Are you running the backup manually or via a savegroup? If you're running it manually, try running the savegroup from the command line and make sure you specify the correct pool with the -b option (ie save -s -b -l full C:\)

If using a savegroup, confirm which pool Networker thinks it should go to by running:

savegrp -p -c usgexg001

Now check that this pool doesn't have any settings in client or saveset, and that the correct tape devices are selected.

Now check the storage node setting is correct in the client configuration for usgexg001 in Networker.

Now make sure that at least one device for the storage node is enabled and able to successfully mount tapes from the pool outlined above.

Now re-try the backup.

HTH,
John