If you want to backup the NAS here is what you need to do. (This assumes no agent on the NAS. No RAWS serial required)
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Verify the account that will be used to backup the device. If the NAS is not in the domain make a local account on the NAS and the BE server. Use this account for backups.
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From Backup Exec Click on Tools > Options > Network and Security > Check Enable Backup of User Shares
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Create a selection list. One way is to right click on User Defined Selections and select Manage User Defined Selections Add the NAS via its unc name \\nas\share
This will allow you to run backups, but there are issues. Every job will complain that the remote agent is not loaded. You might have to play with differential backups, to get them to work, try using dates, not archive bits.
A piece of advice for this install, or anyone else with a NAS. Pick a NAS that supports a RALUS agent. This will dramatically increase the speed of backups. I am not sure if the Lacie supports it, but I know that SNAP servers are supported, and NETGEAR products as well. It is well worth any premium if you have any concerns about backup windows.