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The plot thickens... The MBP is only accessing the NAS for TimeMachine backups. If the iMac is running when the MBP would be doing a TimeMachine backup, then you can do the backup to a drive attached to the iMac. In this case there is no reason at all to buy a NAS. Just use external drives on the iMac.

Basically, if a server is only serving one computer it's much simpler to not have the server at all and just but everything on the main computer.
 
The plot thickens... The MBP is only accessing the NAS for TimeMachine backups. If the iMac is running when the MBP would be doing a TimeMachine backup, then you can do the backup to a drive attached to the iMac. In this case there is no reason at all to buy a NAS. Just use external drives on the iMac.

Basically, if a server is only serving one computer it's much simpler to not have the server at all and just but everything on the main computer.

That's a good idea. The reason I was considering a NAS is for the expandability. I also wanted to use it as an itunes server and torrent box so I can watch content on my TV. The NAS also uses less power then my iMac. I could just have the NAS running 24/7 and the iMac running when necessary.

What do you think?
 
I also wanted to use it as an itunes server and torrent box so I can watch content on my TV.

While a NAS can serve files I'd doubt it could run iTunes to act as an iTunes server on its own. I have no experience with any iTunes server since I've got more than 5 systems and an iTunes server won't work with that. So I either use Plex to serve or run iTunes. I don't have an Apple TV because it wouldn't work with my setup (I use base Mac minis and an old Windows PC as "entertainment servers").
 
For speakers I am looking at getting Audio engine A2 could I connect those to an Apple express for use with my iMac and iOS devices?
 
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