the technology of QR is the same you find in monster storage/backup solutions like Tivoli or Netbackup (incremental differencial on block basis), though the software is clearly designed for personal or soho use.
Once I had a problem I sent a mail to the developer and got detailed and exact help on my case within a couple of hours. That's something you won't find in Tivoli or Netbackup unless you have pretty expensive service contracts!