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Re: [rdiff-backup-users] backup misses files with older date
From: |
Paul Bijnens |
Subject: |
Re: [rdiff-backup-users] backup misses files with older date |
Date: |
Fri, 09 Jan 2009 17:18:18 +0100 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20090107) |
On 2009-01-09 17:01, Chris Wilson wrote:
On Wed, 7 Jan 2009, bt101 wrote:
I installed rdiff-backup and used it for a few days. I was eager to
see how it would handle a small change to a large (2G) truecrypt
file. I added a small file into the truecrypt file and then performed
a backup. To my surprise, the truecrypt file was completely missed
from the backup. I then looked at the modify date of the truecrypt
file and it was old. It seems truecrypt will preserve the modify date
(there's a setting to change it if you wish).
This is an annoying and pointless misfeature of truecrypt. It causes
problems for other backup software as well. Turn it off if you want to
back up truecrypt volumes, and complain to the developers of truecrypt.
Timestamps exist for a reason and subverting them by default is
dangerous and pointless. I'm fairly sure that the ctime will change
whenever the volume is accessed as the timestamp is reset, and therefore
changing the mtime provides only the tiniest shred of obscurity.
Be that as it may, am I to understand that backup programs will
completely miss files that NEED to be backed-up, simply because their
dates are old? Do they not do a checksum or something?
Almost all backup software will honour timestamps. They exist for a
reason. Software that changes the data without changing the timestamp is
broken.
GNUtar includes a file in the incremental backup if the mtime OR ctime
changes. Does rdiff-backup check only the mtime and ignores the ctime?
--
Paul Bijnens
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