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They've moved to use XZ for compressing the migrate export which uses a different algorithm and should provide better compression - at the cost of slower speed and higher memory usage. They've stuck with gzip for the GAiA backups, likely because you can cope with a management server running slow for a bit but it's not desirable on a gateway,
If you needed to manually look at something in the migrate export file use "J" in place of "g" in the tar command, e.g.:
tar tJf <migrate export filename>
With care...
tar xJf <migrate export filename>
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