Want a reliable NAS mirror backup for disaster recovery? This guide explains 3 effective methods, including using RTRR, ShareSync, Rsync, and AOMEI Backupper, and how to sync files from one NAS to another automatically.
NAS mirror backup is a method of creating an identical copy of data from one NAS device to another. When files are added, modified, or deleted on the source NAS, the changes are automatically replicated to the destination NAS to keep both devices synchronized.
Unlike traditional backups that store multiple restore points or versions, NAS mirroring focuses on maintaining a real-time or scheduled duplicate of the original data. This makes it especially useful for users who need consistent data replication and fast recovery without downtime. In the event of a hardware failure, ransomware attack, or accidental deletion on the primary NAS, the secondary NAS can quickly take over as a failover device.
In summary, the main advantages are:
📌 Mirror Synology NAS to Another NAS:
One of the most common use cases is mirroring Synology NAS to another Synology NAS, ensuring that the two systems stay in sync at all times for backup or failover purposes. It can also work in cross-brand environments, allowing users to mirror SynologyNASto other NAS systems for added flexibility and protection.
📌Backup QNAP NAS to Another NAS Automatically:
Another popular scenario is setting up automatic backups from a QNAP NAS to a second NAS device. This process usually runs in the background without user intervention. It works well for environments with multiple NAS devices, such as remote offices, branch locations, or home lab setups, where data needs to stay consistent across systems.
📌Real-Time NAS Sync Across Locations:
Some users require real-time NAS synchronization across different physical locations to improve disaster recovery. In this setup, data from the primary NAS is continuously mirrored to a remote NAS in another office or site.
This helps protect against local risks such as hardware failure, theft, power outages, or natural disasters, ensuring that a safe and up-to-date copy of the data is always available elsewhere.
✅ Use Built-In NAS Replication Features
Many NAS devices come with built-in tools for mirroring and replication. For example, Synology provides Shared Folder Sync, while QNAP offers RTRR and Rsync options for data synchronization. These native tools are often reliable and well-optimized for their own ecosystems, making them a common first choice for NAS-to-NAS mirroring.
However, they also come with limitations. Most built-in solutions work best within the same brand, may require technical configuration, and can be less flexible in mixed-device environments. This can make setup more complex for users who are not familiar with network or backup settings.
✅ Use AOMEI Backupper for Flexible Mirroring
AOMEI Backupper Professional supports NAS-to-NAS synchronization and focuses on simplicity and ease of use, making NAS mirroring more accessible, i.e., mirror one Synology NAS to another, especially across different brands.
It also allows users to set up automatic sync for continuous data protection without manual effort. For users who prefer a quick setup and a visual interface, a dedicated mirror backup tool is often a better choice.
Here we’ll show you how to create NAS mirror backups in 3 effective methods.
⏳Before you start NAS-to-NAS mirror backup:
✅ Make sure both NAS devices are properly connected and reachable within the same network or across remote locations.
✅ Enable SMB or NAS sharing permissions on both devices.
✅ Check if the target NAS has enough space to hold all data on the source NAS. Insufficient storage can interrupt synchronization and lead to incomplete or failed backup.
Step 1. Set full permissions for the shared folder on both NASs.
Step 2. Open AOMEI Backupper after installing. Under the Sync tab, click Mirror Sync.
Step 3. Type a unique name for the NAS mirror backup. Then, select the two NAS devices.
Step 4. To mirror one NAS to another automatically, click Schedule Sync to enable daily, weekly, monthly (by date), etc, and click OK. You can also enable email notification to get timely notifications.
Step 5. At last, confirm your sync settings and click Start Sync to mirror NAS to another one automatically.
To synchronize files between NAS devices of the same brand, such as Sync files from Synology NAS to another one, the best option is to use the built-in sync tool - ShareSync for Synology. You need to install the latest DSM (DiskStation Manager) and download Synology Drive ShareSync from the Download Center.
With it, you can sync shared folders from one Synology NAS (the source) to another Synology NAS (the destination), keeping data consistent across multiple locations in real time or near real time. It will include any changes made to the source NAS, such as adding, editing, or deleting files.
⏳Before you start NAS-to-NAS mirror backup:
✅ Install Synology Drive Server on all Synology NAS devices you want to sync with.
✅ Enable the shared folders you want to sync as Team Folders in Synology Drive Admin Console >Team Folder on the remote Synology NAS.
✅ You must sign in to the local Synology NAS using an account belonging to the administrator group to create Synology Drive ShareSync connections.
Step 1. On your local Synology NAS, open Synology Drive ShareSync, enter the IP address (or the QuickConnect ID), username, and password of the remote Synology NAS to establish a connection.
Step 2. Choose the remote and local shared folders you want to sync. Be sure to check the Enabled checkbox.
Step 3. To modify the settings, select the folder name and click Edit. For NAS mirror backup, switch to the Sync Mode tab and select Two-way Sync. Configure other sync settings and click Done.
QNAP RTRR (Real-Time Remote Replication) is a built-in QNAP replication tool used for fast NAS-to-NAS mirroring and backup. It helps copy and keep data synchronized between two NAS devices automatically, either in real time or on a schedule. One-way sync is usually preferred for NAS mirroring.
RTRR continuously tracks changes on the source NAS, such as new files, edits, or deletions, and syncs to the destination NAS to match. This ensures both NAS systems stay almost identical, which is useful for backup and disaster recovery.
Step 1. Enable RTRR on the destination NAS. Be sure both NAS devices are on the same local network or connected via VPN
Step 2. Log in to your source NAS and open Hybrid Backup Sync (HBS 3). Go to Sync> Create> One-way Sync Job.
Step 3. On the Create a Sync Job wizard, click Remote NAS > Add new account.
Step 4. Configure the Storage Space settings and click Create. This port value must be between 1 and 65535.
Step 5. Select the newly added remote NAS and click Select.
Step 6. Type a unique name. Click the Edits button to add a shared folder on the local and remote NAS.
Step 7. Select the job schedule, such as real-time synchronization, scheduler, run after job, etc.,
Step 8. Deselect Enable filter and click Next > Create > Sync now.
NAS-to-NAS mirror backup is one of the most reliable ways to ensure strong disaster recovery and continuous data protection. It removes the need for manual backups and ensures that both NAS devices stay consistently up to date, allowing you to quickly recover from hardware failures, ransomware attacks, or accidental data loss without major downtime.
For users looking for a simple and flexible solution, especially in cross-brand environments, AOMEI Backupper Standard is a practical choice. It supports NAS-to-NAS mirror backup and scheduled sync with an easy-to-use interface, making it suitable for all users, even beginners, who want to easily manage NAS mirror backup tasks.