[TriLUG] question about backups

[Rick DeNatale]

Warning, the following is going to be way too geeky for 99 44/100% of
the TMUG readership:

It's pretty normal to do this on linux systems with RSync using hard
links.  This way physical copies of files are only backed up when they
change, otherwise directories point to the same unchanged versions of
files if that makes sense.  I'd imagine the same thing could be down
with OS X.  Here's what I think is the seminal page on the idea
http://www.mikerubel.org/computers/rsync_snapshots/

It actually wouldn't surprise me if TimeMachine were doing something
like this under the covers.

Another idea might be to use git. While git is thought of mainly as a
source code repository system, at it's heart it's really a versioned
'file' system which uses SHA hashes to provide a content addressable
system.

On Fri, Mar 4, 2011 at 1:29 PM, Charles Mangin <option8 at option8.com> wrote:
> i'm looking at ways to do backups of large amounts of data that are currently spread across multiple drives.
>
> for a while i was doing a series of rsync tasks, pooling the various drives into images on a larger drive that could hold them all. the point has come now where that's impractical, since the individual drives have each been replaced by larger drives themselves. the last backup that i was able to fit on a single drive did so juuuust barely.
>
> what i'm hoping i can do is somehow just rsync any files that have changed since that last backup date onto a new drive, and use that method going forward. essentially, do an incremental backup from date X. is that possible with rsync or something similar?
>
>
>
>
> Charles Mangin
> Option8, LLC - Making Macs happy since 1999.
> option8 at option8.com | http://www.option8consulting.com
> mobile: 919.368.7167
> skype: option8llc
>
>
>
>
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-- 
Rick DeNatale

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