Snapshot Producing Faulty Archives

Hi,

I need to back up a site so that I can migrate the posts and media to a brand new one. Every time I try to back up it creates archives that won't open properly. I tried to manually import it to the new site and I get the following error:
Processing archive: snapshot-1468271252-160711-210732-84db04c9.zip (38.42M)
Error: Manifest data not found in archive.

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