Date: Wed, 08 Oct 2008 22:03:38 +0200 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Evren Yurtesen <yurtesen@ispro.net> Cc: Volker <volker@vwsoft.com>, Zaphod Beeblebrox <zbeeble@gmail.com>, hackers@freebsd.org Subject: Re: continuous backup solution for FreeBSD Message-ID: <86r66qq2g5.fsf@ds4.des.no> In-Reply-To: <48ECF564.7000204@ispro.net> (Evren Yurtesen's message of "Wed, 08 Oct 2008 21:01:08 %2B0300") References: <48E9E1BB.6020908@ispro.net> <48EA56BB.6040702@vwsoft.com> <48EA8B3A.3090609@ispro.net> <861vysiv9i.fsf@ds4.des.no> <5f67a8c40810070937r5ba89773ncee407ace25fa0dd@mail.gmail.com> <86iqs3sdtp.fsf@ds4.des.no> <5f67a8c40810081015p2c14e38evbeed0a97242a7c4a@mail.gmail.com> <48ECF564.7000204@ispro.net>
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Evren Yurtesen <yurtesen@ispro.net> writes: > Wouldnt that device need to keep the whole filesystem? Like if you > have 10 machines with 10x 1GB drives (lets say each used about 250gb), > you will need 10TB disk space in the backup server? Yes and no and yes... It stores *changes* to the file systems, so how much space it needs depends on how full your file systems are, how often and how much you write to them, etc. Also, at every recovery point, you can discard all but the last change since the previous recovery point for every changed block. FWIW, the exact same answer applies to pretty much any backup solution that supports incremental backups. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no
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