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

From: Chris Wilson
Subject: Re: [rdiff-backup-users] Backup not identifying changed file, even though hash is different
Date: Thu, 24 Mar 2011 20:42:39 +0000 (GMT)
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)

Hi Scott,

On Thu, 24 Mar 2011, Scott Jilek wrote:

Unfortunately, I can't just touch the file because it's in use and locked by the truecrypt process.

In that case, rdiff-backup probably won't be able to open it to back it up either? You'll probably get an error message that the file can't be opened when you try to back it up? And even if you could back it up, you'd probably get an inconsistent and hence useless/corrupt backup if truecrypt is really writing to the encrypted filesystem while a backup or rsync is in progress.

I could try to install one of the windows rsync variants in this case, but the whole idea of a practical backup process to me is getting multiple snapshots in time, whereas rsync only gives me efficient mirroring. I'm not too keen on mirroring as a backup strategy, because corrupted files completely destroy the usefulness of mirroring. If it's bad in the source, it becomes bad in the singular backup as soon as the backup process runs and then you have no recovery option. With Rdiff, I can go back in time to just before the corruption occurred and restore the file to the last know working time. As far as I'm concerned, simple mirroring is not a safe method of backup

You could rsync the truecrypt file to somewhere else, if that works, and then back it up with a separate rdiff-backup command?

Or alternatively create a VSS snapshot and back that up? But Truecrypt would probably need to be patched to be a VSS writer, or to not reset the timestamp when it writes to the file, because you probably can't change the timestamp in the VSS snapshot, it being a snapshot and hence read-only.

Cheers, Chris.
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\  __/ / ,__(_)_  | Chris Wilson <address@hidden> Cambs UK |
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