How to maintain a LAN link to information on an old, semi-retired family PC?

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http://ubuntuforums.org – I have pretty much retired an old PC that labours under less 1GB RAM and an older CPU.......it contains 2 HDD that contain a fair amount of important, at least to me, information and photos. There is also a fair amount of space that might be handy as additional storage. It is happily running Ubuntu 10.04LTS. It has a wireless connection to our LAN but could be easily linked via Ethernet. I would like to link to it periodically to look at and exchange files..........all of our home/LAN PCs run on Ubuntu....no Windows. I'm looking for suggestions as to the best way to maintain a link that (Hardware)