Refactor backup script to create only necessary directories and update SSH config file creation logic

start_backup.sh

@@ -22,7 +22,7 @@ else
 fi
 
 # Create necessary directories
-mkdir -p "$SSH_CONFIG_DIR" "$SSH_HOST_KEYS_DIR"
+mkdir -p "$SSH_HOST_KEYS_DIR"
 
 # Generate host keys if they don't exist
 for key_type in rsa ed25519; do
@@ -36,7 +36,7 @@ for key_type in rsa ed25519; do
     fi 
 done
 
-if [ -f $SSH_CONFIG_FILE ]; then
+if [ ! -f $SSH_CONFIG_FILE ]; then
  
     cat >"$SSH_CONFIG_FILE" <<EOF
 Port $SSH_PORT