Backup & DR Solutions

We are currently in the market for a backup/DR solution. Our current system is grossly outdated and can no longer handle the growth of our organization.

Although I am doing my own research on the matter, I would appreciate your ideas/experiences with the solutions you are currently using or looking into.

Ultimately, I am moreso interested in a disk solution rather than tape.

I realize we can write books discussing these solutions but if you could provide me with a brief description and maybe some quick pros/cons about your current solution in place or any future prospects you have been looking into.

Thanks.