Date: Mon, 6 Oct 2008 16:27:31 -0700 From: George Hartzell <hartzell@alerce.com> To: Mike Meyer <mwm@mired.org> Cc: freebsd-hackers@freebsd.org, hartzell@alerce.com Subject: Re: continuous backup solution for FreeBSD Message-ID: <18666.40675.636312.893786@almost.alerce.com> In-Reply-To: <20081006182558.708e4094@bhuda.mired.org> References: <48E9E1BB.6020908@ispro.net> <001AD718-D25B-421B-8B0F-CE71FA5A7CF0@gid.co.uk> <48EA21AE.80607@ispro.net> <ad79ad6b0810060809s7772db5icc140a19d59b2087@mail.gmail.com> <20081006184934.04A645B4C@mail.bitblocks.com> <18666.33296.607120.889620@almost.alerce.com> <20081006182558.708e4094@bhuda.mired.org>
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Mike Meyer writes: > On Mon, 6 Oct 2008 14:24:32 -0700 > George Hartzell <hartzell@alerce.com> wrote: > > There were a couple of threads about using kqueue or other FreeBSD > > tools to build something like Mac OS X's Time Machine. R1soft's > > software sounds very similar. > > Time machine doesn't do continuous backups, it does them once an hour > or so. People have built similar systems on top of rsync; I did it on > top of zfs (turned out to be to fragile, though). You then just need a > spiffy GUI for wondering through the backups. On the other hand Time Machine does take advantage of a kernel based mechanism that watches file activity and does its best to take advantage of that information to avoid scanning the filesystem when it does a backup. That's the context of the message thread that I pointed to (again, for completeness) http://lists.freebsd.org/pipermail/freebsd-hackers/2008-June/024730.html The thread seemed relevant given the context of backup systems that watch filesystem io. g.
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