Comment 1 for bug 1419822

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Nilnandan Joshi (nilnandan-joshi) wrote : Re: xtrabackup does not memorize user ownership

This is true. As per doc,

"As files’ attributes will be preserved, in most cases you will need to change the files’ ownership to mysql before starting the database server, as they will be owned by the user who created the backup"
http://www.percona.com/doc/percona-xtrabackup/2.2/innobackupex/restoring_a_backup_ibk.html

So if we are taking backup with root, we need to change ownership after restore.