kbackup: command not found

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/bin/kbackup - from package: kbackup

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/kbackup - from package: kbackup

You may install the required package with command apt-get install {package}

Error in other languages:
kbackup: bevel nie gevind nie
kbackup: comandă negăsită
kbackup: comando não encontrado
kbackup: commande introuvable
kbackup: command not found
kbackup: käsku ei ole
kbackup: không tìm thấy lệnh
kbackup: komanda nerasta
kbackup: Kommando nicht gefunden.
kbackup: kommandot finns inte
kbackup: komut yok
kbackup: nie znaleziono polecenia
kbackup: níor aimsíodh an t-ordú
kbackup: no se encontró la orden
kbackup: no s'ha trobat l'ordre
kbackup: opdracht niet gevonden
kbackup: parancs nem található
kbackup: perintah tidak ditemukan
kbackup: príkaz nenájdený
kbackup: příkaz nenalezen
kbackup: команда не найдена
kbackup: командата не е открита
kbackup: 命令找不到
kbackup: コマンドが見つかりません