That's an error related to the compression of the archive file. Either you're trying to read a file that the current software is too old to read, or the file is damaged or corrupt.
Check the versions of the software used to create the archive and what you're trying to import it into (including the versions of Java the servers are using). That's unlikely to be the problem, but you do need to rule it out.
Then, see if you can open the archive/backup file in simple zip/gzip/bzip programs to see if it is a valid file. If they fail, then your backup is broken!
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