Comment 4 for bug 352742

Sorry, the older version seems to have problem still.
Your xtrabackup may access another datafiles at innodb_data_home_dir (not at target-dir).
I think it has been fixed at least at the newest revision.
http://bazaar.launchpad.net/~percona-dev/percona-xtrabackup/trunk/revision/34

Sorry, again. Please try again....