XtraBackup Restore Full Backup OK but I can't initialize mysqld
In Manual itself it is explained that


Decompress backup 

$ innobackupex --decompress /data/backup/2013-08-01_11-24-04/

When the files are uncompressed you can prepare the backup with the --apply-log option:

$ innobackupex --apply-log /data/backup/2013-08-01_11-24-04/



You should check for a confirmation message:

130802 02:51:02 innobackupex: completed OK!

Now the files in /data/backups/2013-08-01_11-24-04 is ready to be used by the server.