I have Windows 2012 Server with 2 ext. USB HDs. During the server backup job creation process, I kept both HDs connected. It labeled them "...DIsk1 " and " Disk2". So I thought I could keep one off-site and rotate them weekly. But it fails to backup whenever I switch them out and each week I end up creating new backup job to get the backup going. I thought if I connect both HDs to the server during the job setup process, Windows will remember both and use either one when the job is to run.