BackupPC_Admin.pl: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/share/BackupPC/sbin/BackupPC_Admin.pl - from package: BackupPC

You may install the required package with command yum install {package}
Error in other languages:
BackupPC_Admin.pl: bevel nie gevind nie
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BackupPC_Admin.pl: comando não encontrado
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BackupPC_Admin.pl: コマンドが見つかりません