We are buying (2) Dell R620 servers and a Dell MD3200 with 2TB storage (Raid 5). On the servers we plan to run VMware Essentials plus and (3) Virtual Servers (SUSE Linux with OES, SUSE Linux with GroupWise 2012 and Windows 2008). The servers will be clustered together. We plan on using our existing Tower Server with our LTO-4 backup drive until we reach it's capacity right now only backup 200GB. We want to do backups to the hard drives of the tower server then push incremental backups to a computer off-site.

If you were going to do this, which backup software would you use and why? Or would you tweak something.

Thanks in advance,