How would this work in regards to backing up the NAS? The former could get a way with a 3-2-1 backup strategy, the latter will require some kind of High Availability solution in addition to frequent, high-performance backups. A system that can be down for a couple of hours (RTO) and only needs to be recovered to COB previous day (RPO) is going to be far less complex and expensive that one that can only be down for minutes or seconds and only lose a few seconds of data. The lower they are, the more complex and expensive your DR solution is going to be. Those two numbers determine the complexity and subsequently cost of your DR strategy. RTO is Recovery Time Objective, which is the measure of time from catastrophic event to (reasonably) functional again. In other words, you can restore data/systems to within X hours/minutes/seconds prior to the crash. RPO is Recovery Point objective, the measure of how much data you can afford to lose expressed as a measure of time prior to the catastrophic event. Piling on what Robert posted: two extremely important numbers to consider: RPO and RTO. You data might be save, but if you do not test how to recover it, it is a good as lost. And one more thing: test the recovery process. Consider at least have a LTO drive and make a weekly backup on tape and a cloud backup. The first is the proper backup timing (a backup every hour or every day) and the second is the retention time for tapes, drives and cloud (unless you are require to keep files for compliance, this one might get a bit big). By having a second copy of the file on a separate storage (like a NAS), a tape or drive, and the either using a cloud storage or second tape copy outside your work place, that will provide most chances of recovering the file. What will happen if the needed file is damaged and then replicate it on the other server? 3-2-1 backups might provide a path to recovery. Having a replicating a server is part of the strategy, but in this case that is for speed up the recovery process or decrease the downtime.
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