You know the hotel was in Chicago. You know you booked it in 2019. But the search bar in Gmail is pulling up newsletters from Expedia and password resets instead of the actual folio. Gmail is excellent at surfacing what arrived this morning, but it is often terrible at digging up a single PDF attachment from a contractor you hired five years ago. Relying on a live inbox means you are always one accidental swipe away from losing a receipt you need for a tax audit.

Synology email backup with Mail Backup X fixes this. It creates an offline archive on your own NAS hardware so you can actually search it when that one critical confirmation gets buried. It’s about setting up a safety net, without compromising the accessibility.

Start by deciding what would actually ruin your afternoon if you couldn’t find it?

A traveler might need that specific visa confirmation number when an airline suddenly cancels a leg of the trip while they are standing at the gate.
At home, it’s usually the warranty for a fridge that just died, or the digital receipt for a laptop purchase the insurance company is suddenly demanding.
For a freelancer, a casual client approval sent in a buried email chain is the only thing standing between getting paid and eating an invoice.

Before you touch the email side, your Synology NAS needs to be ready.

Two most essential points you need to keep in mind:

Mail Backup X Synology runs in a container. So, your data folder has to be deliberately mounted at /data inside the container settings, otherwise everything you download will vanish the next time you update the image.
If you type your NAS IP address and port 18080 into a browser and get a dead connection screen, stop. Go back to Container Manager. Make sure the container actually shows a green status light. Once the login page loads, change the default password immediately, then activate your license or kick off the trial.

If both above points are okay from your end, move on to the next part.

Create the Gmail profile and check its scope

In the Mail Backup X dashboard, click Setup New Profile and pick Google Mail.

This triggers the standard Google sign-in flow. Because Google’s security protocols are notoriously fussy about third-party apps pulling mass data, you’ll likely need an OAuth Helper browser extension to pass the authentication token back to your local NAS.

Pause when the Google account selection screen pops up. If your browser is logged into your personal Gmail, your work Google Workspace, and a shared family account, take a second to click the right one.

It is easy to accidentally authorize a massive download of your corporate inbox onto your personal NAS just because your mouse was moving too fast. Check the access request, authorize it, and wait for the redirect.

Now you need to pick your folders. Selecting the Inbox and Sent folders seems obvious. But if you rely heavily on Gmail labels to organize your life, you might miss the exact history you are trying to save. Gmail doesn’t actually use folders on the backend; it applies labels to a giant bucket of mail.

Mail Backup X translates those tags into a traditional folder structure. Select only the specific labels that hold the records you care about. Sometimes the API name doesn’t perfectly match what you see in the Gmail sidebar, so compare them side-by-side.

Name the profile something that makes it easy to identify. For example, “Personal Gmail Backup on NAS – 2026” is better than “Gmail 1.”

Next is the scheduling of when the tool backs up.

Automatic backup grabs new mail regularly, which is good if you want a system that handles itself. Manual backup is better if you just want to run a one-off archive before you mass-delete a bunch of old mail. Pick the schedule that matches how actively you use the account.

Hit create and let the initial run happen.

When the backup completes, open View Data and confirm everything is the way it should be.

Keep your expectations grounded regarding what this archive actually represents. Mail Backup X keeps the data on your NAS. If you delete an email from the Gmail web interface tomorrow, it stays alive in this local archive. That independence is the point. You can clean out your live inbox without sweating bullets.

Use the archive when Gmail is no longer the right place

Remember this doesn’t replace standard NAS backup practices. If the drives in your Synology fail, the email backups on NAS dies with them. You still need to back up that /data folder to an offsite location.

Sometimes you just want out of the Google ecosystem entirely. If you switch email providers down the road, this NAS backup becomes your permanent reference point.

Mail Backup X lets you export these archived emails into standard formats like PST, MBOX, and EML. This comes in handy if you eventually need to load a chunk of old project correspondence into a desktop client like Thunderbird. Don’t blindly export your entire 15-year history in one go. Export a small batch first. Make sure the attachments open and the formatting isn’t mangled before pushing the larger transfer through.

You also need to check on this setup occasionally. Don’t configure it and ignore it for three years. If you change your Google account password, tweak your two-factor security settings, or do a massive reorganization of your Gmail labels, the backup connection will likely break. Glance at the dashboard’s activity history every few months.

If you go searching for a familiar message and it’s missing, trace your steps. Check if that specific folder is still selected in the profile details. Check if the authentication token expired. Finding the actual point of failure is far more useful than mashing the “Run Now” button and hoping the error resolves itself.

Having a localized, scoped NAS Gmail backup changes how you manage your daily email. Hitting the delete key stops feeling like a permanent risk. The value of this setup comes down to those small decisions you make on day one: picking the right account and grabbing only the folders that matter. Try Mail Backup X Synology free version without any upfront commitments.