nope - when you build the RAID, it will require you to nuke the content. I know that's not what you wanted to hear, but it's true. I would sort through the content and see what is truly necessary and migrate that over to a large external drive, nuke the disks, setup the RAID array and copy the content over to the new storage target. I would go with a RAID 5+1 setup so you'll have 2 failures without killing the array, but that's just me being cautious - have had a 2nd disk fail before it finished copying the content over to a hot spare before so it was well worth that decision. Depending on how much money you want to spend, I like the Drobo B800FS - very user friendly user interface and setup was mind-numbingly simple. We have one at the office and even though it doesn't set a land speed record for IO, it's really reliable and easy to get stats and make changes.