Watch saves folder or files and backup them on changes

backup-saves.py

# ------------------------------------------------------------------------------
# imports
# ------------------------------------------------------------------------------
from datetime import datetime
import glob
import ntpath
import os
import sys
import shutil
import time

# ------------------------------------------------------------------------------
# constants
# ------------------------------------------------------------------------------
SAVES = [
    "C:/Users/Renato/AppData/Roaming/EldenRing"
]
BACKUP_FOLDER = "E:/jogos/PC/Saves/Elden Ring/Backups/"
BACKUP_MAX = 500
BACKUP_CHECK_INTERVAL_IN_SECS = 60

# ------------------------------------------------------------------------------
# functions - backup
# ------------------------------------------------------------------------------
def backup_if_necessary(filename, last_change):
    current_change = last_change

    try:
        current_change = read_change_time(filename)
        if should_backup(current_change, last_change):
            execute_backup(filename)
            execute_delete_old_backups()
    except Exception as e:
        line = sys.exc_info()[2].tb_lineno
        print("Error at "  + str(line) + ": "  + str(e))

    return current_change

def read_change_time(filename):
    # if file, read the change time from the file
    # if directory, iterate the entire tree and find the most recent change of all files
    if os.path.isfile(filename):
        return os.path.getmtime(filename)
    else:
        most_recent_change = 0
        for root, _, files in os.walk(filename):
            for file in files:
                filename = os.path.join(root, file)
                filename_change = read_change_time(filename)
                if filename_change > most_recent_change:
                    most_recent_change = filename_change
        return most_recent_change

def should_backup(current_change, last_change):
    return current_change != last_change

# ------------------------------------------------------------------------------
# functions - backup
# ------------------------------------------------------------------------------
def execute_backup(filename):
    backup_filename = generate_backup_filename(filename)
    copy_file(filename, backup_filename)

def generate_backup_filename(filename):
    filename = ntpath.basename(filename)
    backup_filename = os.path.join(BACKUP_FOLDER, "{}--{}".format(datetime.today().strftime("%Y%m%d_%H%M%S"), filename))
    return backup_filename

def copy_file(source_filename, target_filename):
    print("")
    print(datetime.now().strftime("%H:%M:%S"))
    print("{} = {}".format("SOURCE", source_filename))
    print("{} = {}".format("BACKUP", target_filename))
    if os.path.isfile(source_filename):
        shutil.copyfile(source_filename, target_filename)
    else:
        shutil.copytree(source_filename, target_filename)

# ------------------------------------------------------------------------------
# functions - delete old backups
# ------------------------------------------------------------------------------
def execute_delete_old_backups():
    backups_to_delete = get_backups_to_delete()
    for backup_to_delete in backups_to_delete:
        delete_file(backup_to_delete)

def get_backups_to_delete():
    backup_glob = BACKUP_FOLDER + "**--**"
    backups = sorted(glob.glob(backup_glob), reverse=True)

    if len(backups) > BACKUP_MAX:
        return backups[BACKUP_MAX:len(backups)]
    else:
        return []

def delete_file(filename):
    print("DELETE = " + filename)
    if os.path.isfile(filename):
        os.remove(filename)
    else:
        shutil.rmtree(filename)


# ==============================================================================
# main
# ==============================================================================
# init last change
saves_last_change = []
for i, save in enumerate(SAVES):
    print("WATCH = " + save)
    saves_last_change.append(None)

# create backup dir
if not os.path.exists(BACKUP_FOLDER):
    os.makedirs(BACKUP_FOLDER)

# keep checking if save changed
while True:
    for i, save in enumerate(SAVES):
        save_last_change = saves_last_change[i]
        saves_last_change[i] = backup_if_necessary(save, save_last_change)

    # wait for next check
    time.sleep(BACKUP_CHECK_INTERVAL_IN_SECS)