I was just wondering:

Can I use my Raspberry Pi Model B as a Network Attached Storage?

My plan is to have a wired connection from my router to the Pi, and a 2TB Exfat formatted drive attached to it.

This NAS will be used for video steaming from the harddrive and data backups if possible.

Will there be any lag for the video playback? Devices playing the video will be connected via WiFi.

Thanks!