Re: Tarsnap GUI shows 0 data archived or backed up

[Garance AE Drosehn <gadcode@earthlink.net>]

> On Sep 7, 2017, at 4:21 AM, amar@sdf.org wrote:
> 
>> So, can I make it smaller than 1.07 GB? Am I doing something wrong? I can
>> explain what kind data are part of those 1.45 GB (can give a breakup too
>> if needed).
>> 
>> Can I compress it more, make de-duplication more aggressive? I have used
>> the default config that came with the app.
> 
> Or should I ask it in a separate thread? Or rather shoot a mail to Tarsnap
> support? (But I see Graham is CCed in this mail thread).
> 
> Thanks.

There is one thing to note about de-duplication in tarsnap, compared to some other services.  Tarsnap can only de-duplicate across the files *you* are backing up, on a single specific machine you are backing up.  This is a side-effect of all the privacy and encryption that tarsnap guarantees.

De-duplication works great in some other situations because the other service is de-duplicating files across (say) 20 different Windows machines.  So the first machine may use up 10-gig of space, but all of the rest of the machines might have less than a gig of additional unique files per machine.  Tarsnap cannot do that kind of optimization across multiple machines.

-- 
Garance Alistair Drosehn            =  gadcode@earthlink.net
Senior Systems Programmer           or       gad@FreeBSD.org