Archive IMAP Email Locally: 5 Easy Methods for Backup & Export

Written By Tej Pratap Shukla

Approved By Anuraag Singh

Modified On March 23rd, 2026

Reading Time 12 Min Read

Are you running out of IMAP mailbox space? Learn how to archive IMAP email locally with this step-by-step guide. Before we get into the methods, let’s first understand what an IMAP email archive is.

Nowadays, IMAP is used in most email applications, including desktop email clients. Unlike POP, this email protocol keeps your emails in the online mail server. This makes it easier for you to access your data from any device or location.

Although your data is safe on the server, keeping it on an online platform can cause problems, like IMAP sync issues, a large IMAP mailbox, and the risk of sensitive data theft. To avoid this problem, archiving IMAP data is the best option.

What Does IMAP Email Archive Mean?

IMAP email archiving is the process of moving older or less frequently used emails from the active mailbox while keeping them accessible in the future. This helps users to declutter their primary mailbox and manage storage more efficiently without losing important data, especially when mailbox limits are reached, such as in cases like the Apple Mail storage limit exceeded error.

With IMAP (Internet Message Access Protocol), emails are stored on the mail server. So when you archive emails, you either:

Move them to a separate folder on the server
Export them to local storage
Back them up using specialised Email Backup Software

Why You Need to Archive IMAP Email Locally?

Managing an IMAP mailbox can become challenging, especially with large amounts of email data. Since IMAP stores all emails online, your mailbox can quickly reach its storage limit, which affects performance and accessibility. Additionally, there are many cases in which users want to know the IMAP email archive procedure:

In IMAP, all the emails are stored on the server, which can quickly lead to storage limit exceeded problems. In that case, archiving emails frees up the space to store more data.
Archiving your emails locally adds an extra layer of data protection, as there is always a risk of:
- Accidental data loss
- IMAP server timeout
- Server crashes
- Account breaches
From a business perspective, it is important to archive the important communication for audits and legal matters.
Archiving helps keep your IMAP mailbox clutter-free and makes it easier to organize and manage emails efficiently.
An archive allows you to store emails safely while still being able to access them anytime when needed, without needing an internet connection.
Local archives ensure you have a backup copy even if the server becomes unavailable.

I hope this helps you make an informed decision. Next, I’ll share methods for the IMAP email archive process.

How to Archive IMAP Email Locally?

Archiving IMAP emails locally can be done using different methods depending on the email client or tool you prefer. Since IMAP stores emails on the server, you need to download or move them to a local storage location to keep a secure copy. This can be achieved using desktop email clients like Outlook or Thunderbird, or specialised tools.

In the following methods, I will walk you through step-by-step ways to archive IMAP email locally in a safe and efficient manner.

#Method 1. IMAP Email Archive Via Outlook

If you are using MS Outlook, then archiving your IMAP emails will be easier. The process of archiving the data is the same as archiving regular emails. But first, configure your IMAP account in Outlook, and then archive them using these steps:

Go to File > Options > Advanced
Under AutoArchive, click on AutoArchive Settings
Enable Run AutoArchive every X days and set the frequency
Choose additional options like:
- Prompt before archiving
- Delete expired items (optional)
Click Browse and select or create a PST file where archived emails will be stored
Click OK to save settings
Now, go to your IMAP account and right-click the folder you want to archive
Select Properties > AutoArchive tab
Choose Archive this folder using these settings
Configure preferences and click OK.

Alternative option for the IMAP email archive process:

Open Outlook.
Go to File > Info > Tools > Clean Up Old Items.
Select the folder.
Choose a date range.
Select archive file (.pst).
Click OK.

#Method 2. Archive IMAP Email Locally Using Thunderbird

This approach is free and allows you to configure your IMAP account easily and download emails directly to your system without depending on the server. With Thunderbird, you can store emails locally in formats like MBOX or EML, using the “Local Folders” option, which makes it easier to access or migrate them later.

Here’s how to do it:

Open Thunderbird and click on the menu (three bars) in the top-right corner.
Go to Account Settings > Copies & Folders.
In the Message Archives section, select Keep message archives in > Local Folders.
Click OK to save the settings.
Now go to your IMAP mailbox and select the emails to archive.
Click on the Archive button (or press “A” on your keyboard).
Thunderbird will automatically move the selected emails to the Archives folder under Local Folders.

After following these steps correctly, you’ll receive the MBOX file format.

If you need your data in EML format, then:

Configure your IMAP account in Thunderbird
Open the mailbox and select the folder or emails to export
To export multiple emails, press Ctrl + A (or select manually)
Right-click on the selected emails
Click on Save As
Choose the destination location on your system
Thunderbird will save each email as an individual .eml file

#Method 3. Move IMAP Emails to Archive Via Apple Mail

If you use Apple Mail, archiving IMAP emails becomes quite simple because the application already provides a built-in Archive feature. You can quickly move emails out of your inbox and store them in the Archive mailbox, which helps you keep your mailbox clean without deleting important messages.

Below are the steps to follow:

Open Apple Mail on your Mac
Select the IMAP account from which you want to archive emails
Choose the emails to archive (use Command + A to select multiple emails)
Click on the Archive button from the toolbar (or right-click and select Archive)
Apple Mail will move the selected emails to the Archive mailbox

By default, archived emails remain on the IMAP server, which means they are still synced across devices. If you want to store them locally, manually move emails to the On My Mac mailbox instead of the Archive folder.

#Method 4. Archive IMAP Email Locally (Server-Side Folders)

If you don’t want to download emails to your system but still need to organise them properly, use server-side folders to archive IMAP emails. In this method, emails remain on the mail server but are moved out of the main inbox into a separate archive folder.

For the same, follow this set of instructions:

Open your email client (like Outlook, Thunderbird, or webmail).
Create a new folder and name it Archive (or any custom name) under your IMAP account.
Select the emails or folders to archive.
Drag and drop the selected emails into the Archive folder (or use the Move option).
Wait for synchronisation so changes reflect across all connected devices.

These are the manual methods for the IMAP email archive. However, they may not work for all emails, and many users face difficulties while configuring an IMAP account. Moreover, these approaches are:

Time-consuming
Require technical configuration
Prone to human errors

For example, syncing accounts or exporting emails manually leads to:

Incomplete backups
Missing attachments
Folder structure issues

Additionally, large mailboxes and unstable internet connections can interrupt the process.

To overcome these limitations, next I’ll share a more reliable solution.

#Method 5. Archive IMAP Email Locally Via Automated Solution

SysTools IMAP Downloader archive IMAP emails directly to local storage in desired formats, i.e. PST, EML, MBOX, MSG and PDF, and more. Works on any Windows or macOS. Moreover, the software ensures complete data backup, maintains folder hierarchy, and supports multiple file formats.

Download Now Purchase Now

It doesn’t need any complex synchronisation for the IMAP email archive process. Additionally, with this, you don’t need any third-party service to be installed, such as Outlook, Thunderbird, Apple Mail, or any other.

Without any further ado, try this tool for free, and get these benefits:

Windows: Export IMAP to PST, EML, MSG, MBOX, and PDF.
macOS: Backup IMAP to PST, PDF, MBOX, EML, EMLX, TXT, MSG, CSV, HTML, & MHT
Maintains original folder hierarchy and data integrity
Supports bulk email backup without size limitations
Advanced date filter for selective email archiving
Option to delete emails from the server after backup
Incremental backup to avoid duplicate data
Compatible with all IMAP-supported email services
Simple and user-friendly interface for non-technical users
Preserves email metadata like To, From, Subject, Date, and attachments
Zero data loss guaranteed

After reading these benefits, I’m sure that you want to try this. If yes, then click on the above “Download Now” button and follow the steps below to archive emails:

#Step 1. First, install the software and open it on your Windows or macOS device.

download the software

#Step 2. Click on the IMAP option and choose any destination options as desired.

click imap and choose any destination

#Step 3. Select the Email option and use the date filter to sort out the emails you want to save.

select email and sort out using date filter

#Step 4. Choose the IMAP server and validate it.

choose your desired imap server

#Step 5. Set a destination location where you desire.

provide a destination

#Step 6. Also, add the user by clicking Download template and submitting the CSV in Import Users.

add users from your imap account

#Step 7. Lastly, click on the Start Backup button to start the IMAP email archive process.

start backup process

Within seven quick steps, you can easily back up your entire mailbox in the expected time.

#Method 6. Archive IMAP Email Locally Using Drag-and-Drop

Sometimes, I prefer simple and quick methods for archiving emails. One such approach is using the drag-and-drop feature available in email clients like Outlook or Thunderbird. However, this approach lacks large data archiving, but still, for small data like 10-15 emails, you can follow these guidelines:

Configure your IMAP account in an email client, e.g., Outlook or Thunderbird.
Create a local folder such as “On My Computer” or “Local Folders.”
Select the emails or folders to archive.
Drag and drop them into the local folder.
Wait for the emails to be copied or moved successfully.

What is the Difference Between Archive and Delete?

Most users are confused about whether archiving and deleting are the same. The short answer is NO.

Archiving keeps emails stored and accessible, while deleting removes them permanently.

When you archive an email, it is moved out of your inbox to a separate storage location, but it remains available for future access. You can view or restore archived emails whenever needed.

On the other hand, deleting an email sends it to the trash or deleted items folder, and once it is permanently removed from there, it cannot be recovered easily.

Archiving is a much better approach for long-term email management, especially when dealing with important business or personal data.

Key Challenges Faced By Users While Archiving IMAP Emails

Even though archiving is useful, users encountered a few challenges:

Sometimes emails get duplicated during export.
Local archives can consume disk space.
Improper handling breaks IMAP sync.

To avoid these challenges, use the specified professional solution (Method 5), as all these issues occur when you do the IMAP email archive manually.

When Should Archive IMAP Email Locally?

Archive emails when:

Mailbox exceeds 70-80% capacity
Emails are older than 6-12 months
Projects are completed

Archiving emails is the basic practice to secure data, so do this periodically on a priority basis.

Author’s Verdict

After this discussion, one thing is clear that archiving IMAP emails isn’t optional, it’s essential. By archiving regularly, you keep your mailbox clean and ensure that no critical data is lost. I hope you’ve now clearly learned how to archive IMAP email locally without needing any external help.