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Date: Tue, 1 Aug 2017 12:01:19 +0300
From: Lars Wirzenius <liw@liw.fi>
To: "Neal H. Walfield" <neal@walfield.org>
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Cc: obnam-support <obnam-support@obnam.org>
Subject: Re: Backups of backups
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On Mon, Jul 31, 2017 at 05:28:01PM +0200, Neal H. Walfield wrote:
> Unfortunately, it is cheap to send data, but expensive to read it. If
> I correctly understand how obnam works, then obnam does a lot of
> reading to compare data even if nothing has changed. (If that's not
> true, then please correct me!)
Obnam compares the file metadata (owner, group, mtime, size, etc) to
decide there's a need to make a backup. Reading through all the files
on every backup run would be so slow it'd be silly to do it that way.
--=20
I want to build worthwhile things that might last. --joeyh
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