I am looking at turning my G5 into a server just for files small stuff I no it can't handle to much cause it is a little older I need to get bigger hard drivers but this is what I want to do, turn it into a server so my family can get photos off of it also. Is there a way? (Also I would like to do it for free not pay for service I don't care if there is a domain needed or not )
I can't really update it for some reason I try to put Lion but I would have to update the guts but any help ? thanks...

Mac OS X version 10.5.8
Model Name: Power Mac G5
Model Identifier: PowerMac7,3
Processor Name: PowerPC G5 (3.0)
Processor Speed: 2 GHz
Number Of CPUs: 2
L2 Cache (per CPU): 512 KB
Memory: 2.5 GB
Bus Speed: 1 GHz
Boot ROM Version: 5.2.4f1