I have a unique situation that I would like your help with. I have two MacBook Pros in my family and I'm running out of hdd room. One is 250GB the other 750GB. I also have a WD 500GB Mybook for extra storage and back up of my most precious data. It also is full. I really need to invest in a larger storage device and also start running time machine backups. I've looked into several options and none seem to fit me precisely. I want to be able to have a large amount of expandable space for extra storage, do backup with time machine with both computers, and probably set up some sort of mirroring system, like RAID1, to give myself a little extra protection from drive failure. I know this would be just the start of backup protection, but I need to start somewhere. I also send maybe about 10GB of my "life and death" data to a cloud based storage. The rest of my data is precious, but not life and death. It would just be very inconvenient to loose. Thus, the desire for a little extra protection of RAID1. I would be using it for storage mostly and occasionally accessing files back and forth, and backing up a couple of times a week. My unique situation is that I live on the road in a fifth wheel. A NAS system like Synology DS411j sounds wonderful, but I don't have my own internet per say. I tether with my cell phone and wifi changes from place to place so nothing is constant. The other problem is power. We move from place to place so I'm not always connected into AC power. Now it doesn't bother me that it's not always on but when I was looking into the Drobo products I was reading about problems with people loosing there formatting and the machine acting up after power outages. The machine I get will need to be powered down without affecting it when we move and hardy enough to not go crazy with a accidental loss of power. Also, it will have to be able to take a little bit of jostling on the road. I'm leaning to some sort of 4-bay type storage system but i'm unsure how certain products will be affected with my situation. Any help and advice you can give me is greatly appreciated.