github-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/github-backup - from package: github-backup

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

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