Since Video is the “big” concern (pun intended), I would instead take the approach of RAID for local storage (for the reasons outlined above) and then a single External hard drive backup run, stored physically off-site. For example… how often do the videos change, and how much would be lost per month in catastrophic failure? So if you have, for example, 500 GB of video now, back all 500 GB up to an external drive and store it somewhere physically elsewhere (a safety deposit box is ideal. Family member’s house is also a good option). Then, if you ever have a huge failure on the RAID, all you lose is what you have stored since that copy. But get in the routine of running new files to that drive any time they become critical. Might be once a month… take a Saturday trip to get the drive and copy over all files you’ve created since the last backup. Then, use the standard off-site backup for your other files (much smaller than video files).