We just completed an exhaustive test of the DNS-320 using Retrospect 7.6 backup software and there is good news. This v2.03b01 firmware appears to have fixed the large data file corruption problem that existed in 2.02 firmware. We wrote out over 400K files into 200+ GB of 600MB each, files and then did a thorough compare on the stored files vs. the original files and after 20 hours of testing everything passed! The 2.02 firmware had failed this test.
There may still be a serious issue with the Remote Backup. In our test case, the source Remote Backup on 2.00 firmware did NOT have "Ignore Existing Files" checked. The source was backing up a hierarchy of directories with two leaf nodes say A & B. The target DNS-320 on 2.03b01 firmware had existing files already written in one of the leaf node directories, A, but the source DNS-320 on 2.00 firmware did not have any files in that leaf node directory A and was supposed to backup the files in the other leaf directory B (which it did). The source DNS-320 deleted all of the files in directory A on the target, even though there were no files in A on the source. I think this does not seem to be the correct behavior.