cinder-backup: 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 Debian possible default full paths are:

/usr/bin/cinder-backup - from package: cinder-backup

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

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