[sf-lug] Linux backup software .. that meets unique requirements

Alex Kleider a_kleider at yahoo.com
Mon Mar 15 09:59:00 PDT 2010

The link you give indicates that the file system does NOT support hard links so in effect, each 'snap shot' will end up being a whole extra copy of your file system. i.e. files that have not changed will be copied again and will occupy disk space. Am I understanding that correctly?
I too, am very interested in a solution to this problem you have posed.

--- On Mon, 3/15/10, David Rosenstrauch <darose at darose.net> wrote:

> From: David Rosenstrauch <darose at darose.net>
> Subject: Re: [sf-lug] Linux backup software .. that meets unique requirements
> To: "sf-lug" <sf-lug at linuxmafia.com>
> Date: Monday, March 15, 2010, 8:10 AM
> On 03/11/2010 03:03 PM, David Hinkle
> wrote:
> > Have you considered writing a script that produces a
> copy of the tree
> > you're working on, but encrypts each file with a
> simple symmetric
> > cipher using the filename as the initialization vector
> for the
> > encryption?   Then you can run rsync to
> back that tree up.   Rsync
> > will have to copy any file that changes in it's
> entirety, but the
> > data should be safe.  You could take it one step
> further and cache
> > the md5sums of the files before you encrypt them (like
> duplicity) so
> > you can avoid re-encrypting files that haven't
> changed.   An approach
> > like that might work well enough for a source code
> repository, but
> > will be bad for anything like a database.
> > 
> > David
> Thanks much for the suggestion, David.
> This is indeed the way I was leaning.  But I wasn't
> too thrilled about having to go through 2 full rsync steps -
> particularly because it's a pretty sizable file system
> tree.
> Fortunately I think I've found a neat workaround: 
> Continue backing up as I've been (i.e., using
> rsync/rsnapshot) but have the backup process backup to a
> mount point that is an encfs encrypted directory on top of
> an sshfs remote mounted directory, as described here: http://wiki.rdiff-backup.org/wiki/index.php/BackupToEncfsAcrossSshfs
> Result meets all my requirements:  files are backed up
> using rsync, to my existing storage space, and are encrypted
> both in transit and on disk.
> Going to give this a whirl tonight.
> Thanks much for helping me bat this problem around with
> you, David.
> DR
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