It’s quite unlikely that a RAIDZ2-3 system fails in a way that you lose your data (short of catching on fire), but I also have offsite snapshot backups at rsync

It’s quite unlikely that a RAIDZ2-3 system fails in a way that you lose your data (short of catching on fire), but I also have offsite snapshot backups at rsync.net. 10mbps up is plenty to keep that synced, even if you write hundreds of GB per day.