OK all my HP Microserver is purring away nicely now, as usual I looking for the rainy day. Although my data is on a RAID 5 array my OS is on a single disk. Any suggestions as to the best way to have a copy of my OS on an attached USB Drive? Been considering dump and restoring to the usb disk periodically? or maybe something using LVM or maybe creating and breaking a RAID 1 array? Just not sure of the best plan at the mo. Any tips?