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From: John Nielsen <lists@jnielsen.net>
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Date: Mon, 27 Apr 2009 12:03:57 -0400
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Cc: alligator424@free.fr
Subject: Re: [compiling & installing FreeBSD]
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On Monday 27 April 2009 11:42:15 am alligator424@free.fr wrote:
> does "make installworld " do any backup of the files it touch? is any
> way to failback that "installworld"?

No. Restore from (your own) backups, installation media, or rebuild the 
world you need from appropriately-dated sources.

> I think I have read that "make installkernel" do a backup of the kernel
> in kernel.old but for the world I would like to know.

That is correct, but it is only the kernel (and modules) that are backed 
up this way.

JN