Many servers these days come with internal USB, get a USB to SATA converter and attach it internally to a hot swappable drive bay like the ones made by Icy Dock. Use this like you would a good old fashion tape drive. Backups can be written to these drives and stored in a safety deposit box (couriered by someone you can trust).
I always use bare metal backups because I can do a p2v with them and provides me with more options when trying to recover from a disaster (shadow protect or acronis are good options).
Keep a second onsite backup for day to day restores when they might happen and for disasters that hopefully don't. Third pick an online service that is a SAS 70 II datacenter for backups of key individuals data from the network and personal computer. Give this person the power and control to choose when and what to backup but be careful not to tear down the years of training (if you don't keep it on the network I can't back it up).
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