backup-loaded: 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/backup-loaded - from package: chiark-backup

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

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