Hello Jason,
the world of server NIC teaming is quite varied, but your description of current settings of this NAS server does not call for an etherchannel, if each server port has a different IP address from your switch you see two indipendent hosts.
However, you need to work with server people to understand if these IP addresses are really indipendent or not.
For making an example the server could use these IP addresses only to check network connectivity on the two NICs and the NAS service will use another IP address.
Hope to help
Giuseppe