2.2.11 was used as far as I can see from the backup log:
... innobackupex: Using server version 5.5.12-log
innobackupex: Created backup directory /mysqlbackup/DB_BKP
150630 04:00:04 innobackupex: Starting ibbackup with command: xtrabackup --defaults-group="mysqld" --backup --suspend-at-end --target-dir=/mysqltmp/mysql_temp55/ --datadir="/mysqldata/mysql55/mysql/" --innodb_log_file_size="268435456" --innodb_data_file_path="ibdata1:100M:autoextend" --tmpdir=/mysqltmp/mysql_temp55/ --extra-lsndir='/mysqltmp/mysql_temp55/' --parallel=1 --stream=tar innobackupex: Waiting for ibbackup (pid=19667) to suspend innobackupex: Suspend file '/mysqltmp/mysql_temp55//xtrabackup_suspended_2'
xtrabackup version 2.2.11 based on MySQL server 5.6.24 Linux (x86_64) (revision id: ) ...
2.2.11 was used as far as I can see from the backup log:
...
innobackupex: Using server version 5.5.12-log
innobackupex: Created backup directory /mysqlbackup/DB_BKP
150630 04:00:04 innobackupex: Starting ibbackup with command: xtrabackup --defaults- group=" mysqld" --backup --suspend-at-end --target- dir=/mysqltmp/ mysql_temp55/ --datadir= "/mysqldata/ mysql55/ mysql/" --innodb_ log_file_ size="268435456 " --innodb_ data_file_ path="ibdata1: 100M:autoextend " --tmpdir= /mysqltmp/ mysql_temp55/ --extra- lsndir= '/mysqltmp/ mysql_temp55/ ' --parallel=1 --stream=tar mysql_temp55/ /xtrabackup_ suspended_ 2'
innobackupex: Waiting for ibbackup (pid=19667) to suspend
innobackupex: Suspend file '/mysqltmp/
xtrabackup version 2.2.11 based on MySQL server 5.6.24 Linux (x86_64) (revision id: )
...