How to verify whether backup has been physically copied to tape ?

I have installed OSB and have a tape library. After backing up to the tape, I am able to see successfully backed up message. However is there any other way to confirm the backup really exists on the tape ?
Regards,
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Do a test restore of the data to another folder or another machine? When we install a new environment we always do a test restore to ensure it is working. In the past we have uncovered drive firmware problems with encryption where the backup would work fine but the restore would always fail and the manufacturer had to fix it in the drive firmware. Always best to test.
Thanks
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    2009-11-05 12:11:48.402/875.969 Oracle Coherence GE 3.5.2/463 <Error> (thread=main, member=3):
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            at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$BinaryMap.onMissing
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            at com.tangosol.coherence.component.application.console.Coherence.doList(Coherence.CDB:74)
            at com.tangosol.coherence.component.application.console.Coherence.processCommand(Coherence.CDB:442)
            at com.tangosol.coherence.component.application.console.Coherence.run(Coherence.CDB:39)
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            at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
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