Pat Regan on 1 Nov 2005 13:21:09 -0000

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Re: [PLUG] Re: RAID Backup Server

Tom Diehl wrote:
> There is also rdiff-backup. Uses rsync technology, can talk to a remote
> site over ssh and keeps diffs going as far back as you have the disk space
> to store (if that is what you want). ;)

rdiff-backup is a wonderful piece of software, especially if you want to
keep lots of small incremental backups around.   I like to use
rdiff-backup to backup all my data to a single location.  I keep just
about as many increments as will fit, and I use this location as a
staging area for generating real backups.

The only disadvantage is the CPU hit from generating the differentials
(for anyone who doesn't know, rdiff-backup only stores the pieces of a
file that changed instead of entire copies of changed files).

> The only thing I would like to see is the ability to encrypt the stored
> data on the fly but you cannot have everything.

There is another related project called Duplicity, and I only played
with it a little bit.  Everything is stored encrypted using gpg.  I
didn't much care for the way it handled the encryption, though...

Apparently the default is to use symmetric encryption.  I wanted to use
asymmetric encryption...  I figured that way the backup process would
only need my public key, then I would be able to decrypt it with my
private key.

Unfortunately, Duplicity needs access the encrypted archive.  That means
the backup process needs to be able to have access to the private key...
  At that point I stopped investigating Duplicity :).


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