For those of you running FreeNAS/TrueNAS Core - how are you creating a backup copy of your data that is air-gaped? With my use of RAIDZ1/Z2/mirred V-devs etc, I supsect the biggest risk to my data is user error, and there is some risk of an electrical fault (lightning) frying my systems, hence the reason I'd like to keep a copy or two sitting on a shelf. If any of you are doing this, how? Do you create a Z pool that you simply take out of your machine and put on a shelf? USB external drives?