BackupPC-users

[BackupPC-users] Prevent backuppc redownloading files already in the pool

2014-08-30 10:48:23
Subject: [BackupPC-users] Prevent backuppc redownloading files already in the pool
From: Xavier Crespin <xavier.crespin AT xlmedia DOT fr>
To: backuppc-users AT lists.sourceforge DOT net
Date: Sat, 30 Aug 2014 16:30:27 +0200
Hello,

I've been using backuppc for some time to backup windows clients using 
the rsync/cygwin package available on backuppc's sourceforce repository.
The backuppc server is not in my local network, and machines are being 
backed up over the internet, wich takes some time at first (several 
weeks), but once the pool is populated it runs like a charm.

The problem i face is that if I edit/add a module, or move a directory 
on the windows client, even if the content of the directory is 
identical, backuppc will redownload all the content before doing it's 
md5 hash, wich takes several weeks all over again, even if the files are 
already present in the pool.

What actually happens : Backuppc downloads the file > hash > file 
already in the pool > hardlink created

Is there a way to ask rsync to hash the files on the client side to 
prevent downloading them again?

What i wish would happen : Backcuppc asks rsync to hash the file > hash 
on client > compare client hash with pool hash > file already in the 
pool > no download > hardlink created

Thank you

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