+1, would like to add that I REALLY want this feature. Especially if it could support round trip rotation. i.e., I have 2 (or 3, or 4, etc.) HDDs, I label them A and B. Sunday of Week 1, I attach A. Backup runs to A for the entire week. Sunday of Week 2, I replace A with B, bring A to offsite. Backup runs to B for the entire week. Sunday of Week 3, I exchange B for A (B goes offsite, A comes back on site), Backup runs to B for the entire week. And so on. This provides excellent disaster recovery options for consumers. Ideally, this would resume flawlessly and allow multi-month retention (limited by disk size(s) of course) and the backup interface would tell me when I need a specific medium because the data I want is not on this weeks disk because it's too old.