> I'm not sure what you mean by 'pool' here.  The only thing relevant to 
> what a backuppc rsync transfer will copy is the previous full of the 
> same machine. Files of the same name in the same location will use the 
> rsync algorithm to decide how much, if any, data needs to be copied - 
> anything else will be copied in full.  When a newly transferred file is 
> being linked to the pool, it may be discovered at that point that 
> identical content already exists and a link will be made to save storage 
> space.

Is this true?  Why not just send the checksum/name/date/permissions of the
file first and see if it exists already and link it in if it does.  If the
file does not exist by name but there is a checksum for the file, then just
use the vital data to link in the file and you're done.  I'm thinking
Backuppc shouldn't need to send the entire file for that?

Of course if there is no checksum then it is entirely a new file.  If the
checksum is different but the filename is there then send it via rsync, etc
etc...



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