BackupPC-users

Re: [BackupPC-users] Backup through slow line?

2008-09-04 10:54:35
Subject: Re: [BackupPC-users] Backup through slow line?
From: Rob Owens <rob.owens AT biochemfluidics DOT com>
To: "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
Date: Thu, 04 Sep 2008 10:54:25 -0400
Adam Goryachev wrote:
> Rob Owens wrote:
>> Adam Goryachev wrote:
>>> Holger Parplies wrote:
>>>> a) rsync full backups are only minimally more expensive than incrementals 
>>>> in
>>>>    terms of bandwidth. Still, every file needs to be completely read from 
>>>> disk
>>>>    on both sides, so there is a good reason to offer an "incremental" mode 
>>>> as
>>>>    a speedup.
>>> BTW, 2 x rsync incrementals of the same level will transfer more data
>>> than one full + one incremental. So for example, doing 6 incrementals
>>> followed by a full backup can in fact transfer a lot more data than
>>> doing 7 full backups.
>>>
>>> eg, if a file changes after the full backup, then each incremental
>>> backup will re-transfer those changes. While a full will transfer the
>>> changes but the following full/incremental will not re-transfer those
>>> changes.
>>>
>> This situation can be avoided by setting IncrLevels to 1, 2, 3, 4, 5, 6
> 
>> This way each incremental is based on the previous incremental, and not
>> the previous full.  (Assuming you get a full backup every 7 days).
> 
> Also assuming you use backuppc 3.0 or newer, which means it is not
> available for me as I am using debian stable packages. (Although, I hear
> the next debian stable should be out pretty soon, in which case I'll get
> the newer version then :)
> 
Yes, that's what it sounds like.  It is pretty easy, though, to install
backuppc 3.0 on Etch.  Just download the package from the debian testing
repository, along with libfile-rsyncp-perl (if I remember correctly).
There aren't any other dependencies as far as I know -- but I only use
rsync as a transport, so there may be some samba stuff to download from
testing as well.

-Rob
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