storeBackupConvertBackup: 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/bin/storeBackupConvertBackup - from package: storebackup
/usr/share/storebackup/bin/storeBackupConvertBackup - from package: storebackup

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