Mandatory xkcd : http://xkcd.com/903/ You know, I do this a lot. It affects me in interviews as well. But the paranoid OCD geek in me wants to retain a local copy of all the information in case the internet ceases to be, and as much as I can in my brain. I have considered locally copying wikipedia but given up after the effort that might be required. Anyone got any experience or tips? This is also why I love man page…
Try the wget command line tool; it's generally useful for site-mirroring. "wget --mirror" will recursively download an entire website; if it is impractical to download all of Wikipedia, you may test with the option "-l " to get only a part; then "-p" will make it get all images and whatever needed to display the pages in question. And if you want to only get the text pages/reject the images, the "-A" and/or "-R" options may be useful. Consult the man page and experiment.