I used Acronis 2011 True Image Home to recover 50r1, 50r2, 50r5, 50r6 to HDDs okay (to do a low level recovery). I did have a problem always with 50r3 with different HDDs which were okay. I raised a ticket with Avaya (101005-12329) who also tried it, and they also had the same problem. They issued me 7 files, which I managed to recover. They are in the process of verifying it, before releasing it General Available. Perhaps some issue with compatibility with Acronis??
Avaya's Work Item reference is wi00817134 (the new reference is instead of CR (change request)).
regards
paul