I've recently found out about attic and it seems really interesting, but I'm having trouble backing up large files (ie. dvd images). Is it possible to do something about it - skip deduplication, decrease compression or something that would speed things up?
I've tried creating and running attic on a large directory with many small files and it works great, but now I'm creating a new repository of a bunch of home folders and from the output of lsof I can see it takes several hours to backup large files.
Update: I'm using encryption, transferring over ssh with arcfour and compression enabled over a 10mbit line. It seems that the network is the bottleneck.