Github user nreich commented on the issue:
https://github.com/apache/geode/pull/704
The requirement for the ".gfd" extension currently resides in the
ExportDataCommand from gfsh, the only non-internal entry point to
create/restore a backup. This constraint could be also validated in
RegionSnapshotServiceImpl before starting the local snapshot creation.
I can add a toString to SnapshotOptions, some of the contents will still
return an only somewhat helpful Object.toString() value, but it should provide
the desired information.
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