private void Backup(Backup backup, string backupId, ConfirmCallback canOverwrite)
{
backupId = _backupRepository.GetBackupId(backup, backupId);
var backupExists = _backupRepository.ExistsBackup(backup, backupId);
if (!backupExists || canOverwrite(backup, backupId))
{
_backupRepository.SaveBackup(backup, backupId);
}
}