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Store the complete backup directly to a single file:
innobackupex --stream=xbstream /root/backup/ > /root/backup/backup.xbstream

To stream and compress the backup:
innobackupex --stream=xbstream --compress /root/backup/ > /root/backup/backup.xbstream

To unpack the backup to the /root/backup/ directory:
xbstream -x <  backup.xbstream -C /root/backup/

To send the compressed backup to another host and unpack it:
innobackupex --compress --stream=xbstream /root/backup/ | ssh user@otherhost "xbstream -x -C /root/backup/"