How to setting retention on Disk Staging?

Hello everybody:

   It's neccesary to duplicate images on Basic Disk Storage Unit, to tape. My question appears when I enable the "Enable Temporary Staging Area", and I don't find how to set a certain retention, to the every multiple copies I want to configure.

I suspect this itsn't possible, so I don't find any reference to this item, in the official documentation

Thanks to all.

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