The restic holder copied JetStream's store while the server wrote it; such a
copy may not restore. The nats image now carries mesh-nats-snapshot, run by
the declared dump under the module's own bus account (snapshot API only):
every stream one at a time, flow-controlled, into one tar with a manifest of
counts, sequences and checksums. Restore builds a new store beside the live
one with the bus's own server; a person swaps it in. Proven against
throwaway nats 2.11 servers being written to during the snapshot.
jochen
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