I have a client with 6 laptops. They come to their office only one day a week if that. They are looking for an effective backup solution and since they deal with videos and large files like that, I think that online backup is out of the question. I would like to setup an NAS at their office and install software on their computer that will perform a backup once their laptops are connected to the network. I would prefer the backup to be incremental if possible. The backup solution should not consume too many resources on their computer since they are working when they are in their office. They do not have a file server, or a Domain Controller. Does anyone have any recommendations?