Low cost NAS with auto Flash to HD copy ?

[Kevin Hawkins <lists@xxxxxxxxxxxxxxxxx>]

Is anyone using a low cost NAS drive that supports auto copying on
insert of files from a Flash USB drive to the main HD ?  My parents have
a PC 'less Sonos with a Buffalo LinkStation that has just died.  Works
great except they need to keep asking me to add CD's  Before replacing
the Linkstation I thought copying mp3's to a Flash USB drive and
giving/posting them that to plug in would be ideal.  I know the Infrant
NAS does this but way overkill / too costly / noisy - the LinkStation is
ideal in all respects except not having this copy feature.

K