I don't want to know how I can save a world online so I can play it anywhere, I want to know how to take a world you've been playing with online, and save it so you can play it later. Just had to clarify that, because Google seems to not know what I'm talking about.
If you're playing the Beta version, it's saved straight to your hard drive, at %appdata%/.minecraft/saves
I'm not sure about classic.
Ah, so by "online" I take it you meant SMP?
http://www.minecraftforum.net/forums/minecraft-discussion/suggestions/2221090-incense-what-it-does-how-to-make-it-and-why-it
If you're playing the Beta version, it's saved straight to your hard drive, at %appdata%/.minecraft/savesI'm not sure about classic.
Ah, so by "online" I take it you meant SMP?