cdrestore: 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/cdrestore - from package: cdbackup

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

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