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
lesmikes...@gmail.com
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