Hi, nice setup. Since you are considering that as the backup solution how do you perform the regular data checks on the backup machines ?
(It happened to me several times, that the backup was corrupted - esp. in the days of floppy disks 
Q2: Among the photo groups there is the saying to apply 1-2-3 approach to files (1 orig. photo, 2 backup solutions kinds / 2 geographical places, 3 copies [orig, backup 1, backup 2])
The reason for 2 backup solutions is to avoid being screwed up by 1 way.
How would you design it?