sogo-backup: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/sogo-backup - from package: sogo

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