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What is the difference between safe and vault, where both the words refer to a place where to put things you want to keep safe?

As additional question, why does vault seem more frequently used in computer jargon? For example, the Mac OS X has a File vault, and vault is the word used from anti-virus programs to refer to a place where infected files are kept.

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up vote 4 down vote accepted

A safe connotes something smaller than a vault, and may be movable, while a vault is generally built in-place and would be torn down rather than moved.

The computer jargon use of vault may be due to its connotation of greater security. It is also attractive because it is less common, and is only a noun (in this sense) and thus quicker to interpret, whereas safe can be noun, verb, or adjective (and heavily used in the latter sense in the computer security context).

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A safe is usually smaller than a vault. Safes are often portable, or at least movable, while vaults often are entire rooms.

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+1 Much like boats and ships, you can put a safe in a vault, but not a vault in a safe. –  Dusty Feb 17 '11 at 17:42
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But it is possible to vault over a safe in a boat in a vault on a ship! –  horatio Feb 17 '11 at 18:43
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@horatio: It's possible, but it isn't safe. –  Robusto Feb 17 '11 at 18:47
    
Additionally, vault is sometimes used metaphorically to refer to protected electronic storage, while I've never heard safe used that way. –  JSBձոգչ Feb 17 '11 at 19:11
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@JSBangs, @horatio: Let's not forget the fact that the OP was talking about things someone wants to keep safe. Presumably that doesn't include Microsoft products. I'm just sayin' ... :) –  Robusto Feb 17 '11 at 20:03
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