automatic_backup.py

import shutil
import os
import time

with open('program_started.txt', 'r+') as program_started_file:
	# If program was previously started, runs instructions. If not, continues as normal
	program_started = program_started_file.read()
	if program_started == 'False':
		# Gets src path file and dst path file, write only
		src_file = open('path_src.txt', 'w')
		dst_file = open('path_dst.txt', 'w')
		# Gets src and dst paths
		src_path = input('Enter source path: ') 
		dst_path = input('Enter destination path: ')
		# Writes src and dst paths to txt file
		src_file.write(src_path)
		dst_file.write(dst_path)
		# Moves to beginning of document
		program_started_file.seek(0)
		# Writes 'True' in front of prevous 'False'
		program_started_file.write('True')
		# Removes 'False'
		program_started_file.truncate()
		# Displays 'Completed' message
		print("Completed getting source and destination paths")
	elif program_started == 'True':
		# Gets src path file and dst path file, read only
		src_file = open('path_src.txt', 'r')
		dst_file = open('path_dst.txt', 'r')
		# Checks if flash drive is plugged in
		while True:
			if os.system('cd D:') == 0:
				# Returns to the beginning of the file
				src_file.seek(0)
				dst_file.seek(0)
				# Stores src path and dst path in string
				src = src_file.read()
				dst = dst_file.read()
				# If a 2nd backup has been made, removes first and renames 2nd
				if os.path.isdir(dst + "_2") == True:
				 	shutil.rmtree(dst)
				 	os.rename(dst + "_2", dst)
				 	dst = dst + "_2"
				 # If only a 1st backup was made, creates a 2nd
				elif os.path.isdir(dst) == True:
					dst = dst + "_2"
				# Copies data
				print('Backing up...')
				shutil.copytree(src, dst)
				print('Completed')
				# Sleeps for 20 minutes
				for x in range(1,12):
					print("Second: ", x)
					time.sleep(1)
			else:
				# If no flash drive is detected, tries again in 5 minutes. 
				time.sleep(600)
	else:
		# Error message if program_started.txt != true or false
		print("Error: program_started.txt must only contain either 'True' or 'False'.")