I'll be transitioning to some new Santa Rosa MBP's along with my colleagues during the course of this month, but I'm wondering what to do about the pre-SR machines we've got. I've already budgeted for and have received spares which we'll be using in rotation. The idea is that when we have hardware issues, we walk into the storeroom and pick up a spare, onto which we restore our individual Superduper backups. Then (hopefully), individually take the responsibility of getting it turned around by Apple. I have a feeling that bit will fail, so I'm wondering if it might be a good idea to have the repaired pre-Rosa MBP's hanging around as a further failure buffer. Is there an issue at all in mixing pre-SR MBP's into this scenario? (i.e. Superduper restores might be restoring an active SR install onto a non-SR machine, and non-SR to SR) I can't see it but I haven't tried it yet.