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[rdiff-backup-users] Re: Backup not identifying changed file, even thoug

From: Remy Blank
Subject: [rdiff-backup-users] Re: Backup not identifying changed file, even though hash is different
Date: Wed, 23 Mar 2011 19:42:28 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100305 Thunderbird/ Mnenhy/

Scott Jilek wrote:
> How does Rdiff identify changes that trigger backup?  I know the file 
> times/file size will not change since it's a fixed size 1GB container 
> and Truecrypt purposely doesn't update file timestamps, but the hash 
> will change as the contents will change.

That's the problem, rdiff-backup uses the file size and mtime. Both of
which don't change here. The same happens when you open Microsoft Excel
files without saving them: the content changes, but Excel resets the
mtime back to the old value.

> Is there any way to force Rdiff to use a hash compare for difference 
> triggering?

No, there isn't. I asked for exactly this a few weeks ago and didn't get
a reply.

-- Remy

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