While I can appreciate that ZFS snapshots are very useful in being able to
recover files that users might have deleted, they do not do much to help when
the entire disk array experiences a crash/corruption or catches fire. Backing
up to a second array helps if a) the array is off-site and for many of us the
cost of remote links with sufficient bandwidth is still prohibitive,or b) on
the local network but sufficiently far away from the original array such that
the fire does not corrupt damage the backup as well.
This leaves some form of removable storage. I'm not sure I'm aware of any
enterprise-level removable disk solution, primarily because disk isn't really
designed to be used for offsite backup whereas tape is.
The biggest problem with tape was finding a sufficiently large window in which
to perform the backup. ZFS snapshots completely solves this issue, but Sun have
failed to provide the mechanism to protect the data off-site.
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