Just as a side note, I understand that there is a bit of a push on for doing more things in bulk. As courses grow in number, there is going to be an increase in demand for disk space. This may not have been a big issue in the past, but it is not going to go away. OK, disk space is cheap, but we can't hold on to everything. So I think we can reasonably expect to see things like bulk deletions of older backups, unless you want to create a deliberate archive somewhere for them, in the not too distant future.