dbackup: 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/sbin/dbackup - from package: awit-dbackup

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

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