timemachine: 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/timemachine - from package: timemachine

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

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