By Delia / Last Updated September 10, 2020

What is NAS mirror backup?

A mirror backup is an identical copy of the source data as the name suggests, and NAS mirror backup refers to the mirror backup between NAS and NAS, which is usually achieved by the means of data synchronization.

Different from normal backup method, mirror backup copies all the individual files and folders to the destination separately with no image file. You can get access to the backup directly instead of keeping it just in case. And since it includes literally everything without any compression, it needs more storage space than other backup methods for sure.

Create Nas Mirror Backup

Why create a NAS mirror backup?

Why do you need to create a NAS mirror backup? The answers vary. But with the knowing of mirror backup and data sync, it’s easy to imagine its advantages in following situations:

  • There’s an on-going job that needs to be done by different people on different devices with many work files;

  • You need keep the data on two NAS exactly the same for the timeliness and accuracy of information;

  • You want to give the data on NAS an extra insurance to prevent accidental data loss or corruption.

In these cases, you can sync NAS to NAS instead of copying and transferring those files manually.

How to mirror NAS backup?

To create NAS mirror backup, the first thing you should prepare is a powerful tool that can sync data between NAS.

There are many options for you to choose but the one I recommend most is AOMEI Backupper Standard. It’s a backup software with powerful functions and intuitive interface. Even a new user of it can acquaint the operation easily. Besides, it is free for you to create a NAS mirror backup.

Meanwhile, if you are using Synology NAS, you can also consider downloading tools from Synology Download Center to do a NAS to NAS sync, Synology Drive Server is an example .

Now let me show you the detailed steps to sync files between two NAS.

Method 1. Create a NAS mirror backup with free AOMEI Backupper

In AOMEI Backupper Standard, you can achieve the goal of creating NAS mirror backup by using file sync. Comparing with other sync software, the sync feature of AOMEI Backupper Standard has its own advantages. It allows you to synchronize files and folders to other locations including local disk, external hard drive, another computer on the network, NAS, removable USB flash drive and so on; it can be used combing with other practical features, such as schedule.


1. Download AOMEI Backupper Standard, install and launch it. Click Sync on the left sidebar and then select Basic Sync.

File Sync

2. Input a Task Name for your NAS mirror backup to make a distinction between it and other backups. Click Add Folder, then select Share/NAS.

Share Nas

3. Click Add Network Location. Input IP address, username and password of the NAS you want to mirror.

Select Synology Or Qnap Nas

4. Then specify the destination NAS in the same way.

Select A Cloud Drive

5. Tap Start Sync button to begin the sync. When it is done, click Finish to quit the interface.

File Sync Complete

6. If you want to manage the folders that are applied with Basic Sync, you can find the task in Home page and click its icon with three stripes to expand the menu.


  • If you want to auto sync NAS files on a daily, weekly, monthly basis or only once at a specific time, you can click Schedule to adjust the settings before starting sync.

  • Every time you sync an existing sync task, the source directory will be compared with the last mirror backup, any changes and newly added files will be synchronized to the target directory, while the deleted files won’t.

  • You can also make use of Real-Time Sync, which is a paid feature of AOMEI Backupper Professional. With it, the program will real-time monitor the source directory needing sync. If there’s any change happens to any file or folder in source directory, the program will sync them immediately and provide real-time backup for your data.

Method 2. Sync data between multiple Synology NAS

If you are using Synology NAS, you can install the latest DSM (DiskStation Manager) and download Synology Drive Server or Cloud Station from Download Center as an alternative, then run the tool on your host and client Synology NAS servers.

Take Synology Drive Server as an example. It is a centralized file sharing and syncing service that allows you to access the most updated files on multiple Synology NAS client devices. To seamlessly sync the data, one Synology NAS device should be chosen as the host server, and the rest of the paired Synology NAS devices will act as client devices.


1. To sync files between the centralized NAS server and the client Synology NAS devices, the first thing you should do is establishing connections. To be more specific, enter the IP address, username, and password of the host Synology NAS device.

Synology Drive Server Enter Password

2. Choose the remote and local shared folders that you want to sync, check Enable and click Apply button.

Synology Drive Server Choose Remote Folder

3. When the setup process has been completed, a new connection will show in sync tasks for you to manage.

Synology Drive Server Finish

4. Now you can create sync tasks with the connected NAS, or click + button to add another new NAS following the steps above.


  • This method only applies to Synology NAS with the latest DSM.

  • For problems like cannot connect to the host Synology NAS device, you can refer to this tutorial for more details.


Compared with ordinary backup, mirror backup has its own characteristics and advantages to save you a lot of time and energy if used properly.

To create a NAS mirror backup means to sync data between two NAS - you can achieve it by some sync tools. So far as I tried, the File Sync feature of AOMEI Backupper Standard is one of the best solutions. It’s quick and safe with fewer restrictions and practical auxiliary functions, like Schedule. And you can enjoy the sync feature totally for free.

Not only NAS to NAS, AOMEI Backupper Standard also supports you to sync files between computers, sync OneDrive Automatically, sync local folder to Google Drive and so on.