Les Mikesell wrote:

> Jason M. Kusar wrote:
>   
>> I'm currently using BackupPC to back up our network.  However, I have 
>> one server that has over a terrabyte of data.  I am currently running a 
>> full backup that has been running since Friday morning.  I have no idea 
>> how much more it has to go.
>>
>> My question is if there is a way to avoid ever having to do a full 
>> backup again.  Most of this data will never change.  Is there a way to, 
>> for example, have every 7th incremental filled to become a full backup 
>> instead of actually performing a full backup?
>>     
>
> If you use rsync as the transport you never actually transfer unchanged 
> files again - you only make a pass over the files comparing block 
> checksums.  This takes some time/cpu at each end but not a lot of bandwidth.
>   
So that means that even a full backup uses the old backup as the basis 
for the transfer?  I assume also then that files deleted off of the 
server will not be deleted off the backup since the default rsync 
options don't include any of the delete options.  Is there a way to fix 
this?
>   
>> Also, a slightly unrelated question.  How does CGI interface handle 
>> deleted files hen viewing incremental backups for the SMB transport 
>> mechanism?  Does it just wait for the next full backup so that the files 
>> disappear?  Is this any different for the rsync mechanism?
>>     
>
> I think it just overlays the current incremental on top of the last full 
> so deleted files will still appear to be there.
>
>   
That's kind of what I figured.  Unfortunately, I have some servers that 
have a constant creation and deletion of files.  This might make it 
difficult to tell which files would actually need to be restored and 
which are no longer needed.  I'll have to investigate this a little further.

Thanks!
--Jason



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