mysqlbackup mysql enterprise utility issue
Since it is a backup, you are right to be concerned with whether it can be restored or not.

To be on the safe side, you must run

chown -R mysql:mysql /var/lib/mysql


immediately after the backup so mysql doesn't barf when restoring it.

Otherwise, you may get an OS error concerning file permission during the restoration or mysql startup

[root@******* 20130101_000]# perror 13
OS error code  13:  Permission denied