Backup systems?

[Tom Buskey]

I've use NetApps and now use ZFS.  Both have snapshots.  Both can be setup
(NetApp is by default) to take a snapshot every X minutes, hour, day, week
month. They typically add about 10% to the space and really help with the
"oops I deleted" things.

I want something for when 2 drives die and also to archive a point in time
onto tape/DVD to store offsite.
I don't trust an unpowered external drive to preserve the data; the
manufactures don't design or test for that.
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