Backup recommendations

I've got a budget proposal due next month and wanted to know what other spiceheads were using for their backups.

I'm only interested in backing up the data in the interest of saving space, and here's what needs to be backed up:

1 Exchange mailbox database server (~500GB)
1 MS SQL server with SharePoint Databases (~20GB)
3 File servers (~2.5TB)
1 Domain controller to backup AD

Two of the file servers are physical machines with local storage and the rest are VMs on ESXi 5.5 with their data residing on an Equalogic.

Our current system uses Symantec System Restore and Dell RD1000s to backup data to a 'cartridge' (overpriced hard drive with a plastic case) and then it is taken offsite. Clunky, I know, but it is a leftover from before this company had an IT department.

Per company policy, we can't back up to the 'cloud', so that is not an option,...