Date: Fri, 2 Jan 2004 14:30:11 -0800 From: paul beard <paulbeard@mac.com> To: Eric Rescorla <ekr@rtfm.com> Cc: freebsd-questions@freebsd.org Subject: Re: Plan 9 style backup utility for FreeBSD? Message-ID: <39F490BE-3D73-11D8-8FEF-000A95BBCCF8@mac.com> In-Reply-To: <20040102172714.507A371B6@sierra.rtfm.com> References: <20040102172714.507A371B6@sierra.rtfm.com>
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On Jan 2, 2004, at 9:26 AM, Eric Rescorla wrote: > I'm finally getting to the point where my disk capacity massively > outruns my tape capacity, so I'm thinking of converting to removable > disk-only backup. I could just use Amanda to backup to disk, but I'm > intrigued by Plan 9's archival filesystem where backups from (say Jan > 1, > 1999) would go in /1999/1/1 and you could just find the files directly > rather than grovelling through dump files. > > Is there some standard tool for doing this on FreeBSD? You can't just > do a direct copy cause this results in major disk space wastage so I'm > imagining you need to use hard links or something to keep the size > down. > I followed this on your weblog and I may be missing something: I keep coming back to some cocktail of find(1), ctime(3), diff(1) and friends (pax, tar) to locate and mirror only changed files in a duplicated hierarchy. If I'm understanding it, in 1999/1/1 you might have a file tree that looks like the "live" one with only files that were modified on 1999/1/1, but all other files would be links back to their unchanged versions. I like the idea of it. -- Paul Beard <www.paulbeard.org/> paulbeard [at] mac.com
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