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User Case: Can You Link Two Synology NAS Together

“I'm sure this has been asked before, but seems like there's a lot of out-of-date information out there, and I'm curious what people are doing in 2023:

I have a DS3617xs (primary) and a DS2414+ (backup/secondary), and I'd like to set this up as kind of a poor man's live backup. Basically, I want them to mirror each other, so that if one goes down, I can just manually switch over and keep using the backup until the primary is restored.

The interwebs suggest I use Synology Drive, but I don't really see information on how to setup the second NAS as a client. I tried Rsync before, but it didn't work that reliably for me. I'm either missing something, or overcomplicating it. Appreciate any advice!” – A Question from Reddit

Why Make Synology Sync between Two NAS?


Synology NAS, namely Synology Network Attached Storage device, is a versatile hardware solution that enables centralized data storage and sharing for multiple users and devices on a network. This storage device operates using either hard disk drives (HDD) or solid-state drives (SSD) to store data, and offers a wide range of features such as data backup and sync, remote access, and more.

To keep a backup of data in a remote location, many users would like to sync between two Synology NAS so that data can be always up-to-date, which helps to ensure that data is consistent across all devices and locations. On top of that, syncing two Synology NAS devices also improves productivity and collaboration within a team or organization.

Many users are wondering “how can I connect 2 Synology NAS together”. In this article, we will show you how to make Synology sync between two NAS easily and simply via an excellent cloud sync service – MultCloud.

How to Make Synology Sync between Two NAS


MultCloud, a smart and useful cloud-to-cloud sync service, is a web-based platform that allows users to connect multiple cloud drives together. It supports more than 30 popular cloud storage services on the market, such as NAS, Amazon S3, Flickr, Google Drive, SharePoint, OneDrive, Dropbox, OneDrive for Business, Dropbox Business, MEGA, iCloud Photos, Box, etc.

This helpful tool helps users manage multiple cloud storage accounts and services in one place so that users don’t need to worry about frequent account shifting. With MultCloud, users can easily upload documents to OneDrive, download photos from Google Photos, rename a Google Drive folder, share a Dropbox folder, and more.

Apart from basic operations, one of the most useful features on MultCloud is the cloud-to-cloud sync, which helps users sync folders from one cloud to another directly on the web. And there are some detailed conveniences:

  • No Need to Download and Upload Manually. MultCloud allows users to sync folders between cloud drives directly without downloading and uploading, which save time and improve sync efficiency.
  • 9 Excellent Sync Methods. Users can make one-way and two-way sync on MultCloud based on their requirements. For example, users can start Mirror Sync, Cumulative Sync, Update Sync, Real-Time Sync, and more.
  • Automatic Sync Enabled. MultCloud has the ability to schedule sync missions, allowing users to sync files between cloud services at specific times. Users can choose from four scheduling options, including running tasks at a specific time, daily, weekly, or monthly.

Then, let’s figure out how to make Synology sync between two NAS via MultCloud in a hassle-free way:

Step 1: Register a MultCloud account if you don’t have one. Or, you can log in with your Facebook or Google account.

Sign Up
Sign Up

Step 2: Navigate to the left sidebar and hit the Add Cloud button. Then add your Synology NAS by hitting to its icon and follow the on-screen guidance. Next, apply the same way to add another Synology NAS account.


Step 3: Go to the Cloud Sync tab on the left taskbar. Then choose one Synology NAS as the source cloud and another Synology NAS as the target cloud. If you want to choose sync methods, you can hit the tab on the box. Finally, you can press the Sync Now button.

Sync NAS to NAS
Sync NAS to NAS

By doing 3 steps above, you can sync files between two Synology NAS devices easily and quickly. This is much more helpful than the traditional download-and-upload way. To ease your burden, you don’t need to oversee the syncing process. Once you enable the Email Notification feature (by heading to Options), MultCloud will notify you when the task is finished.

Likewise, you can also sync Google Drive with Dropbox easily and directly without downloading and uploading. Furthermore, MultCloud offers the leading syncing speed, so even if you have a variety of files, they can be synced in a fast manner.

In the End

After reading the whole text, you now know how to make Synology sync between two NAS without any effort by using a FREE and useful third-party service – MultCloud. Anyway, this service is free to get started and offers many useful features.

In addition to syncing data across clouds, users can also transfer and back up data from one cloud to another effortlessly. What’s more, when you want to download videos from websites, MultCloud gives you a direct and simple way to accomplish the task with ease.

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