Backing up from a NAS

Hi, I have a question in regards to backing up from a NAS box. We have a full backup which runs on a Saturday morning and as it is a NAS box we cannot install the agent therefore it does limit some features. 

So, for my question. We have a backup which is 934GB for the NAS, and 40GB for a PC which backs up to the same drive, it is a 2TB tape and on the second week backup it seems to run out of space.

Am I correct in saying that because the NAS cannot have the agent installed, this therefore means backup sets do not work and it has to backup the whole directory separately therefore reaching the maximum space on the tape? If so, is there a way around this?

 

Thanks in advance for any help.

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