[Unison-hackers] Sneaker Net or Incremental Backup

[Benjamin Pierce]

Both of these features would be easy to implement using information  
that Unison already has available.  If you want to give it a try, I  
can tell you where to start.  (I'd be reluctant, though, to add this  
code to the main sources -- Unison arguably has too many flags and  
switches already!)

Best,

     - Benjamin

On Dec 27, 2008, at 10:27 AM, Duane McKinney wrote:

> I searched, but came up empty.  Can this be done.
> I sync two offices using unison.
> 1) (Optional)I would like to be able to set a preference that says,  
> don't try to
> sync a file if it would require X bytes transferred
> 2) Get a list of changed files from a root.  That way I can copy the  
> files to a
> removable drive and sync them when I get to the other office.
>
> Here is my reasoning.  Most of the time, root changes are very  
> small, a few MB.
> But Let's say that I download a new CENTOS release and place it on  
> the file
> server.  This may be a poor example, because I could retrieve it  
> over the
> internet again, but just bear with me.  I would like for unison, to  
> instead of
> trying to sync this file over the network to skip it.  The I would  
> like to be
> able to say once a week, run a job, that would take the differences  
> in the root
> and sent them to a USB drive.  I can then carry this drive to  
> location 2, and
> update the root there.   Then from my understanding, the network  
> sync would
> detect that both roots are identical.
>
> That way, our bandwidth isn't being eaten up for hours/days, trying  
> to perform a
> sync that will most likely fail because it will take so long.
>
> Also, this would be more useful, than synchronizing the whole root  
> to a usb
> drive, because, the total of the data that I am synchronizing is >  
> 1TB.  I would
> not mind moving a few GB (<100) via USB.  I am trying to avoid  
> needing either, a
> lot of time, or a bunch of USB drives (one for each root).
>
> I have not yet looked at the source, but I would assume that most of  
> the items
> required for this feature are already in place.  Is it feasible?  Is  
> there
> already a way?
>
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