Comment 1 for bug 1098566

innobackupex --copy-back/--move-back checks innodb_data_home_dir,
innodb_data_file_path and innodb_log_group_home_dir correctly.
So, it is better to use it.

wsrep_sst_xtrabackup can be modified to use a temporary directory and then use innobackupex --move-back to handle correctly.