By Yuka / Last update December 23, 2021

What is Bidirectional Sync

Windows Bidirectional Folder Sync

File synchronization (or syncing) in computing is the process of ensuring that computer files in two or more locations are updated via certain rules. It is often used for home backups on external hard drives or transfer updates on external hard drives to cloud. Before knowing about bidirectional synchronization, it’s necessary to know the one-way synchronization.

In One-way Sync mode, the updated files are copied from a source location to one or more target locations, any changes in your source location, like creation, deletion, modification, will be synced to the destination, but no files are copied back to the source location.

In Bidirectional Sync mode, also called two-way sync, the updated files are copied in both directions, usually with the purpose of keeping the two locations identical to each other. Any changes in the source path will be synchronized to the destination; any changes in the destination path will be synchronized to the source as well.

Benefits of Bidirectional Folder Syncing

Nowadays, as people need to store more and more data and files in life or work, the storages where they store data are also changing. For instance, many users back up files to different cloud storages in order to make files easily accessible no matter where they are or what device they are using. Other storage devices such as external hard drives, NAS, and USB flash drives are also commonly used.

At the same time, two-way folder synchronization has become one of the most popular backup modes with its outstanding advantages.

✪ Bidirectional Folder Syncing Saves You Time. If you use this mode to synchronize two folders, you do not need to manually go back and change the copy when there is any change in the source or destination location. By ensuring that all copies of the file are updated at the same time, you can save a lot of time.
✪ Bidirectional Folder Syncing avoids using the outdated file. In this mode, any changes in the document can be synchronized to both locations in time, which can ensure the timeliness and accuracy of the document. Therefore, you will not miss important changes in the document, and small oversights like this may have a negative impact on your work.

How to Sync Folders Both Ways in Windows 10/8/7

If you want to perform bidirectional folder syncing, it is highly recommended to use the most reliable two-way sync softwareAOMEI Backupper Professional. It runs smoothly on Windows 10/8.1/8/7/Vista/XP, including 32-bit and 64-bit.

Take a look at its synchronization function:

Versatile sync modes: it offers Basic Sync, Mirror Sync, Real-Time Sync, and Two-Way Sync. You can choose one mode that best meets your need.
Abundant sync destinations: It allows you to sync files between two folders, drives, or computers. You are also allowed to sync folders with NAS or Cloud, such as sync two Synology NAS servers, sync local folder to OneDrive.
Automatic File Sync: it allows you to schedule synchronization, which can help you get changes regularly by syncing files at daily/weekly/monthly.

Next, I will give you a graphic tutorial to teach you how to sync two folders in windows 10/8/7 via AOMEI Backupper Professional. First of all, download and install it.

Download Free Trial Win 10/8.1/8/7/XP
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Step 1. Launch AOMEI Backupper. On the left panel of this program, click “Sync” and then select “Two-Way Sync”.

Two-Way Sync

Step 2. You can edit the task name to distinguish this task from other tasks. Then click “Add Folder” to select the folder you want to sync.

Add Folder

Tip✍: You are only allowed to choose one source folder in one task when performing Two-Way Sync. If you choose the other three synchronization modes, you can synchronize multiple folders at once.

Step 3. Click the bar under the arrow to select another folder as the destination folder.

Select Sync Destination

Step 4. (Optional) If you want to set up an automatic two-way synchronization, you can click “Schedule” in the bottom and choose a proper frequency in the Schedule Settings window.

Schedule Settings General

Step 5. Confirm all the settings and click “Start Sync”. Any changed files will be synced from the source to the destination as well as the other way around.

Start Sync

Options: You can write comments for your current operations and set up email notifications so that you can receive notifications about task results in time.


To sum up, AOMEI Backupper Professional will be your best choice to perform Windows bidirectional folder sync. With its user-friendly interface, you can use it to perform file synchronization with just a few clicks.

It’s worthy to mention that AOMEI Backupper Professional also provides many other powerful functions, including Backup, Restore, Clone and other Tools. If you plan to replace the hard drive with an SSD to improve your computer’s performance, you can use it to do data migration, such as  migrate data to Kingston SSD, WD Blue SSD, etc. It can also help you to solve Windows 10 startup problems and Windows 10 backup problems.