There is always the option to take 'metadata' snapshot and just thin_dump content of metadata to a file (located in some 'safe' place)
Something as "dmsetup reserve_metadata_snap", thin_dump, "dmsetup release_metadata_snap" ? If so, I'm already using for testing purpose ;)
However validation of 'restore' if there are some 'snapshots' is questionable as the b-tree describing mapped blocks may change significantly so 'rescued' content may than reference lots of bad blocks.
Sure, with snapshots the situation is surely more complex, as due to the CoW the old metadata can point to stale data, right?
If you want to just protect 'superblock' against disk fault - usage of 'raid' could be an option - but ATM there are some 'related' costs with management of 'stacked' device tree.
Both my tmeta and tdata reside on a RAID6 array provided by a BBU-protected RAID card, so I should be safe here.
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