Is there a risk on backing up with Networker a disk that is being deduplicated by Windows?
What if NW is connected to a DataDomain?
There is an article where they explain a possible Data loss when recovering individual files from a backed up Windows Server 2012 deduplication volume. (link to the article below)
According to the article is safe to backup Windows Deduplicated volumes if you use the following string
** For Networker 8.x
Within NMC navigate to:
Confiiguration> Clients > right click on clients>properties> Apps & Modules>Save operations box
Add the string
All Windows Server 2012 deduplication volumes will be backed up unoptimized, and will be recoverable, when this flag is set
**Also be aware of the changes in your backup after turning off the optimization, as you may face increases in the amount of data backed up.