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# How to Move Your Time Machine Backups to a New Drive Safely
- URL: https://macfixly.com/move-backups-new-drive-time-machine/
- Published: 2026-10-07T21:15:00.000Z
- Updated: 2026-10-07T21:15:00.000Z
- Description: Step-by-step guide on how to move your Time Machine backups to a new drive safely without risking data loss or backup corruption.
- Author: Macuser
- Tags: Mac Backup, Time Machine, Data Migration, External Drives

You’ve been using Time Machine to back up your Mac, and now it’s time to switch to a new external drive. Maybe your current backup disk is running out of space or showing signs of wear, and you want to keep your entire backup history intact. Knowing **how to move backups to a new drive in Time Machine** safely can save you hours of frustration and prevent potential data loss.

This article guides you step by step through the safest methods to migrate your existing Time Machine backups to a new drive. You’ll learn what to prepare before starting, how to copy backups correctly, and how to verify that your [new backup setup works smoothly](https://macfixly.com/p/c4d93e11-dad4-47e4-888f-669da7d14e51/). Along the way, practical tips will help you avoid common pitfalls often left out of generic guides.

## Key takeaways

- Turn off Time Machine before disconnecting your old backup drive to avoid corrupted backups.
- Format the new drive as APFS or Mac OS Extended (Journaled), depending on your macOS version.
- Use Finder’s Copy or Disk Utility to clone your backup folder without altering permissions.
- Assign the new drive as your Time Machine disk via System Settings to continue automatic backups.
- Run a test backup and check backup integrity before [erasing the old drive](https://macfixly.com/p/32e0d889-5b01-4f10-930c-022895524ebb/).

## Before You Start: What You Need to Prepare

Before you begin moving your Time Machine backups to a new drive, it’s essential to gather the right tools and information to avoid any setbacks. First, ensure your new external drive is formatted correctly for Time Machine compatibility. The drive should be formatted as either APFS (Apple File System) or Mac OS Extended (Journaled), depending on your macOS version and backup preferences. You can check and adjust this format in Disk Utility.

Next, consider the size of your existing backup. Your new drive must have at least the same capacity as your current backup to accommodate all saved data and future backups. To check your backup size, select your Time Machine backup folder, right-click, and choose “Get Info” to see the total size.

Also, make sure your Mac is connected to a power source and that you have enough uninterrupted time to complete the transfer, as it can take several hours depending on backup size. Verify the health of your current backup drive using Disk Utility’s First Aid feature to detect any errors that might cause problems during copying.

Finally, if possible, create a separate temporary backup of important files to an additional drive or cloud service. This extra step provides a safety net in case anything goes wrong during the migration process.

1. Check the format of your new drive in **Disk Utility**. You should see APFS or Mac OS Extended (Journaled). If not, reformat the drive and confirm the new format appears.
2. Verify the backup size by selecting your Time Machine backup folder, right-clicking, and choosing **Get Info**. The size should be less than or equal to the new drive’s capacity.
3. Connect your Mac to power and close all unnecessary apps to prevent interruptions. You should see the charging icon indicating power connection.
4. Run **First Aid** on your current backup drive via Disk Utility. The tool should report no errors or successfully repair any found.
5. Optionally, copy your most critical files to a separate location and confirm they are accessible.

## Turn Off Time Machine and Disconnect the Old Backup Drive

Before you start moving your backups, it's essential to stop Time Machine from running automatically. This prevents it from accessing your old backup drive mid-transfer, which can cause data corruption or incomplete copies. To disable automatic backups, open **System Preferences** and select **Time Machine**. Then, uncheck the box labeled *Back Up Automatically*. You should see the status change to "Time Machine is Off" or similar confirmation.

Next, safely eject your old backup drive. Open a Finder window and locate your external drive in the sidebar under *Locations*. Click the eject icon next to the drive name. Alternatively, you can right-click the drive and select *Eject*. Wait until the drive disappears from the sidebar or your desktop, indicating it is safe to disconnect.

After ejecting, wait at least a few minutes before unplugging the drive physically. This pause ensures all background processes, including indexing or final write operations, have fully stopped. Skipping these steps can lead to corrupted backup files or incomplete backups, which will cause problems when you try to [restore or continue backups](https://macfixly.com/p/d5c72e95-8adb-46b8-a403-cb918cdf3c04/) on the new drive.

1. Open **System Preferences** and click **Time Machine**. You should see the Time Machine control panel.
2. Uncheck *Back Up Automatically*. The status should update to confirm backups are turned off.
3. Open a Finder window and find your old backup drive under *Locations* in the sidebar.
4. Click the eject icon or right-click the drive and choose *Eject*. The drive should disappear from the sidebar or desktop when it is safe to remove.
5. Wait a few minutes to ensure all system processes finish interacting with the drive before unplugging it physically.

## Format and Prepare Your New Backup Drive

Before you can use your new drive for Time Machine backups, it must be formatted correctly. Open **Disk Utility** by searching for it in Spotlight or finding it in the Utilities folder within Applications. In Disk Utility, select the new drive from the sidebar to access its formatting options.

![Format and Prepare Your New Backup Drive – how to move backups to a new drive in Time Machine](https://macfixly.com/content/images/2026/10/move-backups-new-drive-time-machine-2.webp)

1. Click **Erase** at the top of the window. This opens the format settings.
2. Choose a name for your drive that clearly identifies it, such as *Time Machine Backup* or *Backup Drive 2*. This helps you distinguish it from other drives later.
3. Set the **Format** to either *APFS (Encrypted)* or *Mac OS Extended (Journaled, Encrypted)*. Both are compatible with Time Machine, but APFS is optimized for SSDs and newer macOS versions, while Mac OS Extended is often preferred for traditional hard drives and offers wider compatibility.
4. Ensure the **Scheme** is set to *GUID Partition Map*. This is required for bootable and backup volumes on Macs.
5. Click **Erase** to begin formatting. When it finishes, your drive is ready for Time Machine.

Here’s a quick comparison of the two formats:

| Format                                 | Best For                   | Notes                                                        |
| -------------------------------------- | -------------------------- | ------------------------------------------------------------ |
| APFS (Encrypted)                       | SSDs, macOS 11 and later   | Faster backups, optimized space management                   |
| Mac OS Extended (Journaled, Encrypted) | HDDs, older macOS versions | More compatible with older systems and Time Machine versions |

Once formatted and named clearly, your new drive will be recognized by Time Machine and ready for the backup transfer.

## Copy Your Existing Backups to the New Drive

To preserve your entire Time Machine backup history, you need to copy the **Backups.backupdb** folder from your old drive to the new one without altering permissions or metadata. Using Finder for this task is possible but often unreliable because it may not fully preserve extended attributes and permissions, risking data integrity.

A safer method is to use the Terminal with *rsync*, a command-line tool that can accurately copy files while maintaining all metadata. The recommended command is:

`sudo rsync -avE --progress /Volumes/OldDrive/Backups.backupdb/ /Volumes/NewDrive/Backups.backupdb/`

Here, `-a` preserves permissions and timestamps, `-v` enables verbose output, and `-E` preserves extended attributes and resource forks. The `--progress` flag shows real-time copying progress, so you can monitor the transfer.

1. Open Terminal from Applications > Utilities.
2. Type the above rsync command, replacing `OldDrive` and `NewDrive` with the actual volume names, then press Enter. You should see a detailed list of files being copied.
3. Wait for the process to finish; copying 500GB can take several hours, and 1TB may take significantly longer, depending on drive speed.
4. When the command completes without errors, verify that the **Backups.backupdb** folder exists on the new drive with all expected files.

Alternatively, reliable cloning tools like Carbon Copy Cloner can perform this task with a graphical interface and built-in safeguards for preserving backup integrity. However, avoid simple drag-and-drop in Finder to prevent incomplete transfers.

## Set the New Drive as Your Time Machine Backup Disk

1. Open **System Settings** from the Apple menu. You should see a sidebar; scroll and click on **General**, then select **Time Machine**.
2. Click the **Select Backup Disk…** button. A list of available drives will appear. Locate and select your newly prepared backup drive.
3. Check the box labeled **Encrypt backups** if you want added security. This option is recommended if your backups contain sensitive data. If you enable encryption, you will be prompted to create a password—store it safely.
4. Click **Use Disk** to confirm your choice. Time Machine will now recognize the new drive as the backup destination.
5. Verify the change by returning to the main Time Machine pane. You should see the new drive’s name listed as the backup disk, along with the status indicating it recognizes the existing backup history.
6. To ensure continuity, initiate a manual backup by clicking **Back Up Now**. The backup should resume incrementally from where the copied data left off, rather than starting over.

By following these steps, you reconfigure Time Machine to continue incremental backups seamlessly on your new drive. Watch for any alerts or errors during the first backup attempt, which can indicate issues with permissions or drive recognition.

## Verify Your Backups and Start a Test Backup

After completing the migration, it’s essential to verify that your backup history is intact and that Time Machine can continue backing up without errors. Start by browsing your backup snapshots on the new drive. Open the new backup drive in Finder, navigate to the **Backups.backupdb** folder, and check for folders named by date and time. These represent your backup history; seeing a continuous timeline confirms successful copying.

![Verify Your Backups and Start a Test Backup – how to move backups to a new drive in Time Machine](https://macfixly.com/content/images/2026/10/move-backups-new-drive-time-machine-3.webp)

Next, initiate a manual backup to ensure Time Machine is functioning properly. Open **System Preferences** \> **Time Machine**, then click **Back Up Now**. Monitor the progress in the menu bar icon. A successful backup completes without error messages and shows a new snapshot with the current timestamp.

Finally, compare backup sizes and timestamps between the old and new drives. Timestamps should follow the previous backup’s chronology, and sizes should be similar (minor differences may occur due to system changes). If errors appear, such as *“Backup failed,”* check the Console app for detailed logs, which often indicate permission issues or disk errors.

1. Open Finder and navigate to the new backup drive's **Backups.backupdb** folder—ensure dated backup folders are present.
2. Go to **System Preferences** \> **Time Machine** and click **Back Up Now**—watch for progress in the menu bar.
3. Confirm the backup completes without error and that a new backup folder with the current date appears in Finder.
4. Compare backup folder sizes and timestamps with the old backup to verify continuity.
5. If backup fails, open the **Console** app, filter by “backupd,” and review error messages to identify issues.

## Troubleshoot Common Issues When Moving Time Machine Backups

If you encounter permission errors, start by running Disk Utility's First Aid on both the new backup drive and your Mac's internal drive. Open Disk Utility, select the drive, and click **First Aid**. If errors persist, use Terminal with the command *sudo chmod -R +a "user:yourusername allow read,write,execute" /Volumes/YourBackupDrive/Backups.backupdb* to adjust permissions. Replace *yourusername* and *YourBackupDrive* accordingly.

Should Time Machine prompt you to start a new backup instead of continuing, it often means the new drive’s backup folder is not recognized as a continuation. Verify the copied backup folder’s name exactly matches the original, and confirm drive formatting and encryption settings match the previous setup. Time Machine requires consistent encryption status; a mismatch can cause it to treat the backup as new.

If formatting or encryption mismatches are suspected, reformat the new drive with the required scheme (APFS or Mac OS Extended Journaled) and encryption option matching the old drive. This step can prevent Time Machine from discarding prior backups.

When persistent errors or confusing messages occur despite these steps, consider seeking professional help or starting fresh backups. A fresh backup ensures reliability but sacrifices historical data, so weigh this against troubleshooting time.

1. Run Disk Utility First Aid on both drives. Success means no errors reported.
2. If needed, use Terminal permission commands with correct paths and usernames. Success means no permission denied errors when accessing backup files.
3. Check the backup folder name and drive format/encryption. Success means Time Machine recognizes the backup and offers to continue.
4. If issues remain, decide whether to consult a professional or erase and start fresh. Success means either resolved errors or a clean new backup setup.

## Frequently asked questions

### Can I move Time Machine backups between drives of different sizes?

Yes, you can move Time Machine backups between drives of different sizes. The new drive should have enough free space to hold the entire backup history from the old drive. If the new drive is smaller and cannot accommodate all backups, the transfer will fail or some backups may be excluded, so always verify available space before starting.

### Is it safe to move Time Machine backups using drag-and-drop in Finder?

Using drag-and-drop in Finder to move Time Machine backups is generally not recommended. Finder may not preserve all necessary metadata and permissions, which can corrupt the backup. The safest method is to use Disk Utility’s Restore feature or the Terminal command 'ditto' to ensure all file attributes and links remain intact.

### What happens if the backup transfer is interrupted?

If the backup transfer is interrupted, the copied backup on the new drive will be incomplete or corrupted. You will need to delete the partial backup and restart the transfer from the beginning. To avoid interruptions, ensure your Mac stays awake and connected to power during the entire process.

### Do I need to reformat my old backup drive after moving backups?

Reformatting the old backup drive is not required after moving backups, but it is recommended if you no longer plan to use it for Time Machine. Reformatting frees up space and prepares the drive for other uses. Just make sure you have verified your new backup is complete and working before erasing the old drive.

## What This Guide Does Not Cover

This guide assumes you have a moderate level of comfort using Disk Utility and Terminal. If you are unfamiliar with these tools, proceed cautiously or seek assistance to avoid accidental data loss. Additionally, moving backups does not guarantee data integrity if the old drive is failing; in such cases, starting a fresh backup may be the safer option. This advice focuses on direct external drive migration and does not cover networked backups or Time Capsule scenarios, which involve different processes and potential complications.

After completing the migration steps, the single most useful next step is to perform a full Time Machine backup to the new drive and confirm you can browse and restore files from it. This test backup ensures the new disk is properly configured and your backup history remains intact, giving you confidence that your data is protected moving forward.

**See also:** [How to Fix Time Machine Backup Stuck on Preparing Backup](https://macfixly.com/p/d614b69d-5b0f-4015-afea-ae61c4f24361/) · [How to Change Backup Frequency in Time Machine: Step-by-Step Guide](https://macfixly.com/p/1804bccd-446f-49c3-801e-5d152d83f5af/)