See this thread, and in particular, Holgier's response:

http://sourceforge.net/mailarchive/forum.php?thread_name=46922898.2040102%40bio-chemvalve.com&forum_name=backuppc-users

-Rob

Pablo Fernandez wrote:
> Hi
> 
> Got that, but if I use rsync would there be a reason to have a full
> backup every hour or so? Does it make sense to have a full once a month,
> level 1 incrementals every week, level 2 incrementals every day and
> level 3 incrementals every hour?
> 
> Best regards,
> Pablo
> 
> 
> On Sun, 2007-12-30 at 21:32 -0800, Craig Barratt wrote:
>> Pablo writes:
>>
>>> Thanks for that information, this brings another question:
>>>
>>> What's the point of having multiple full backups? Wouldn't that be
>>> redundant with the information of a full backup and the incrementals?
>> Full backups provide two things:
>>
>>   - a reference point for the following incrementals,
>>
>>   - an accurate backup, in contrast to tar and smb incrementals that
>>     don't detect deleted, renamed or newly-created files with old
>>     modification times (eg: extracting a tar file).
>>
>> If you keep an incremental, you need to keep the prior full (and also
>> prior lower-level incrementals).  Therefore, full backups are the ones
>> you typically keep if you want longer-term history.
>>
>> Craig
> 
> 
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