While comparing the contents of my Drobo (version 2) with its backup, I noticed that of the ~13,000 files, about 15 were different. In each case (where I could determine it) the file on the backup was the good one and the file on Drobo was bad.
Is this a common issue?
I was using rsync (with -cnav) on my Mac Pro (Leopard 5.8) to compare the two directories. Drobo was connected via FW800 and the backup Disk uses eSATA.
The backup disk is rarely on (only when backing up), but Drobo is on all the time and is usually connected to my Time Capsule and shared to the rest of the network.