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Maybe I don't understand how journaling FS's work. Is it really true that a journaling FS can recover back, say, 4 years of changes? I know that revision control systems can do this, but they take a lot of setup and administration; and can sometimes be fragile.

Is this possible with the kind of hardware that you mentioned in your article? Or do you need something in addition?

Sorry if I'm being dense here. If you have examples or can amplify on this, it would help me a lot.