Backup files when they change! (I'm looking at you, Minecraft Dungeons....)

Readme.md

Requirements

• Latest NodeJS: https://nodejs.org/en/download/

Save file location

Microsoft Store

C:\Users\{USER}\AppData\Local\Packages\Microsoft.Lovika_8wekyb3d8bbwe\LocalCache\Local\Dungeons\{ID}

Standalone

C:\Users\{USER}\AppData\Local\Dungeons\{ID}

---

How to use

node <Save file location> <Existing backup dir>

The script will backup all folder contents everytime something chanes, but a trottle of one minute.
The throttle has a rising edge and a falling edge trigger, to it will backup the first change and last change.
MC Dungeons likes to save to the save file 10 times in a row, lol

Minecraft Dungeons Backuper.js

// C:\Users\Stefan\AppData\Local\Packages\Microsoft.Lovika_8wekyb3d8bbwe\LocalCache\Local\Dungeons
const fs = require('fs');
const path = require('path');
const assert = require('assert');

const [toWatch, toBackup] = process.argv.slice(2);

assert(fs.existsSync(toWatch), `cannot find dir ${toWatch}`);
assert(fs.existsSync(toBackup), `cannot find backup dir ${toBackup}`);

console.log('\n\n\n\n');
console.log('stating watcher for', toWatch);
console.log('will backup to', toBackup);

const watcher = fs.watch(toWatch, {recursive: true});

watcher.on('change', (event, path) => event === 'change' && backup());


const BACKUP_THROTTLE_TIME = 1 * 60 * 1000;
let lastBackup = 0;
let postPoneTimer = null;

function backup() {
	const now = new Date();
	console.log('\n');
	console.log('~~~~~', now.toString(), '~~~~~');
	
	if(lastBackup + BACKUP_THROTTLE_TIME > now.getTime()){
		console.log('backup postponed, last backup was too close');
		
		if(!postPoneTimer){
			postPoneTimer = setTimeout(() => {
				console.log('\n\n\n\n ~~~~ retrying postponed backup... ~~~~~');
				postPoneTimer = null;
				backup();
			}, BACKUP_THROTTLE_TIME + 1000);
		}
		return;
	}
	
	lastBackup = now.getTime();
	
	const dirToBackupTo = path.join(toBackup, `${now.getFullYear()}-${pad2(now.getMonth())}-${pad2(now.getDate())}-${pad2(now.getHours())}-${pad2(now.getMinutes())}-${pad2(now.getSeconds())}-${Date.now()}`);
	
	
	console.log('backing up:', toWatch, 'to:', dirToBackupTo);
	fs.mkdirSync(dirToBackupTo);
	copyFolderRecursiveSync(toWatch, dirToBackupTo);
	console.log('\n');
}
backup();

function copyFileSync(source, target) {

    let targetFile = target;

    //if target is a directory a new file with the same name will be created
    if (fs.existsSync(target)) {
        if (fs.lstatSync(target).isDirectory() ) {
            targetFile = path.join(target, path.basename(source));
        }
    }

	fs.copyFileSync(source, targetFile);
}

function copyFolderRecursiveSync(source, target) {
 
	console.group();
    //check if folder needs to be created or integrated
    const targetFolder = path.join(target, path.basename(source));
    if (!fs.existsSync(targetFolder)) {
		//console.log('mkdir', targetFolder);
        fs.mkdirSync(targetFolder);
    }

    //copy
    if (fs.lstatSync(source).isDirectory()) {
        const files = fs.readdirSync(source);
        files.forEach( file => {
            const curSource = path.join(source, file);
            if (fs.lstatSync(curSource).isDirectory()) {
                copyFolderRecursiveSync(curSource, targetFolder);
            } else {
				//console.log('copy', curSource, '->', targetFolder);
                copyFileSync(curSource, targetFolder);
            }
        });
    }
	console.groupEnd();
}

function pad2(x) {
	return x > 9 ? x : `0${x}`;
}

Start MCD Backup.ps1

node  ".\Minecraft Dungeons Backuper.js" "C:\Users\Stefan\AppData\Local\Packages\Microsoft.Lovika_8wekyb3d8bbwe\LocalCache\Local\Dungeons\2533274963056686" "C:\Users\Stefan\Desktop\MCD Backups\Backups"