Nigel Kendrick wrote:
> Hi,
>  
> I have had a read, but I am none the wiser...
>  
> I understand that incremental backups are hard-linked delta copies based 
> on the last full backup, but when a new full backup is performed, is 
> this done as a complete new transfer, or are full backups also built 
> from deltas of the last full backup and/or incrementals?

You need to separate the xfer method from the storage to understand this.  With 
tar or smb methods, the entire contents of a full are transfered.  With rsync 
or 
rsyncd, this is a delta against the previous full (or incrementals if using 
levels) but if any content has changed in a file, a complete new copy is 
reconstructed on the backuppc server side.  Then, regardless of the method, all 
content that matches a file in the pool is discarded and replaced with a 
hardlink - and all new/changed files have a new link added to the pool (there 
are no per-file deltas stored).

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com



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