Great question — answering as the UphillTech team:
i'm not sure on watching the series online but you can buy .hack//SIGN , .hack//Legend of the Twilight and .hack//ROOTS on Madman. .hack//G.U. Trilogy can be brought from Hanabee but it pales in comparison to the game in my opinion. all of these are Australian so they are in Region 4 but you should be able to find them on your local distribution site(s) but it wont be a problem if you have a region free player. .hack//Terminal Disk is a special that came with .hack//G.U Pre-orders which details the events between the last episode of .hack//SIGN (After the Game) and the first episode of .hack//ROOTS (before the .hack//G.U games) but ignores most of what happens in .hack//Legend of the...
Full answer by Memor-X: https://anime.stackexchange.com/a/8543 (CC BY-SA 3.0).
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