If you're stuck with a massive WordPress site and the standard All-in-One WP Migration
plugin is hitting a size limit, you don't actually need a "hack"—you just need to adjust how the plugin reads your server's limits.
Here is a guide on how to fix the upload limit and handle migrations up to 100GB (or more) effectively. 🚀 The "100GB Fix": How to Bypass Upload Limits
The most reliable way to handle huge files is to increase the import_allow_full_access or modify the constants.php file within the plugin itself. Access your Files
: Use an FTP client (like FileZilla) or your hosting Control Panel’s File Manager. Navigate to the Plugin Folder wp-content/plugins/all-in-one-wp-migration/ constants.php : Open this file and look for the line defining AI1WM_MAX_FILE_SIZE Change the Value By default, it might look like define( 'AI1WM_MAX_FILE_SIZE', 536870912 ); (which is 512MB). To set it to 100GB, change it to: define( 'AI1WM_MAX_FILE_SIZE', 100 * 1024 * 1024 * 1024 ); Save and Refresh
: Go back to your WordPress dashboard. The "Maximum upload file size" should now reflect your new limit. 💡 The Better Way: The "Import via FTP" Method
For a 100GB site, uploading through a browser is risky because the connection can time out. Instead, use the folder method: Upload the .wpress file directly to wp-content/ai1wm-backups/ using FTP. All-in-One WP Migration > Backups in your WordPress dashboard. Your 100GB file will appear there automatically. Click
Note: The "Restore" feature in the free version may be limited; you might need the Unlimited Extension for files of this size. 🛠️ Server-Side Tweaks
If the plugin change doesn't work, your server might be blocking the upload. Add these lines to your
php_value upload_max_filesize 100G php_value post_max_size 100G php_value memory_limit 512M php_value max_execution_time 300 php_value max_input_time 300 Use code with caution. Copied to clipboard ⚠️ A Note on Large Migrations
Migrating 100GB is taxing on shared hosting. If you encounter "stuck at 0%" or "Archive not found" errors: Check Disk Space
: Ensure your destination server has at least 200GB free (100GB for the file, 100GB to extract it). : If you have SSH access, use
to run the migration. It is much more stable for massive databases. Are you seeing a specific error code allinone wp migration 100gb fix
like "404 Not Found" or "Disk Space Full" during your 100GB import?
To bypass the upload limit in All-in-One WP Migration without paying for the Premium extension, you generally need to modify the plugin's code or adjust your server settings. 🛠️ The Quickest Fix: Edit Plugin Code
This method directly changes the limit defined within the plugin. Go to Plugins > Plugin File Editor. Select All-in-One WP Migration from the dropdown. Open the file: constants.php. Search (Ctrl+F) for the string: AI1WM_MAX_FILE_SIZE.
Change the numerical value to: 100 * 1024 * 1024 * 1024 (this equals 100GB). Save the file. ⚙️ The Server-Side Fix
Even if the plugin allows 100GB, your server might block it. Edit your .htaccess file (usually in the root folder) and add these lines: php_value upload_max_filesize 100G php_value post_max_size 100G php_value memory_limit 1024M php_value max_execution_time 0 php_value max_input_time 0 📦 The "Pro" Workaround (No Plugin Editing)
If the file is truly 100GB, web uploads will often fail due to timeouts.
Use FTP: Upload your .wpress file directly to /wp-content/ai1wm-backups/. Restore: Go to the plugin's Backups tab in WordPress.
Action: Your 100GB file will appear there; just click Restore.
📍 Note: Large migrations often crash on cheap hosting. Ensure your disk space is at least 250GB to handle the compressed file and the extraction process. If you’d like, I can help you: Write a custom PHP function to automate this Troubleshoot timeout errors during the import
Suggest alternative tools like Duplicator or WP-Vivid for massive sites AI responses may include mistakes. Learn more
Moving massive WordPress sites can be a headache, especially when the free version of All-in-One WP Migration hits you with its default upload limits. If you're looking for a "100GB fix" without the premium extension, here are the most effective workarounds. 1. The "Big File Uploads" Plugin Trick
The easiest, no-code way to bypass the limit is using the Big File Uploads plugin. If you're stuck with a massive WordPress site
How it works: It uses "chunking" to upload large files in smaller pieces, which tricks the server into accepting massive backups.
Setup: Install the plugin, go to Settings > Big File Uploads, and manually enter your desired limit (e.g., 102400 MB for 100GB). 2. Downgrade & Code Patch (Version 6.77)
Later versions of the plugin patched the ability to easily edit file size limits in the code. Many developers revert to version 6.77 to apply a manual fix.
Step 1: Download and install version 6.77 (available on sites like GitHub).
Step 2: Go to Plugins > Plugin File Editor and select All-in-One WP Migration.
Step 3: Open constants.php and find the line defining AI1WM_MAX_FILE_SIZE.
Step 4: Replace the existing value with a much higher one. For 100GB, use:define( 'AI1WM_MAX_FILE_SIZE', 100 * 1024 * 1024 * 1024 );. 3. The FTP "Restore" Bypass
If your server keeps timing out during the browser upload, bypass the "Import" screen entirely.
rsync -avz --progress -e ssh /old/path/wp-content/ user@newserver:/new/path/wp-content/
Database:
wp db exportwp search-replace or a script.Update wp-config.php with new database credentials.
If you have SSH access, use the plugin's CLI commands: Database:
# Export
wp ai1wm export --file=/path/to/backup.wpress
Quick checklist to attempt in order
- Try exporting to remote storage (S3/Google Drive) and import from there.
- Install official Unlimited / split extensions.
- Upload the .wpress to server via SFTP and place in ai1wm import folder, then import.
- If plugin import still fails, extract and restore files + import DB via mysql CLI.
- Contact hosting support to lift server limits or perform server-side import.
Method 2: The "Import from Local Storage" Fix
If you have the Unlimited Extension for All-in-One WP Migration (or are using a version that supports direct server imports), this is the best method for large files.
Instead of uploading through the browser, you upload the file directly to the server and tell the plugin to read it from there.
-
Upload the Backup File:
Connect to your new server via FTP. Navigate to the following path (you may need to create these folders if they don't exist):
wp-content/ai1wm-backups/
Upload your massive .wpress file here. Even if it takes hours, FTP is stable.
-
Restore from Plugin:
- Go to your WordPress dashboard on the new site.
- Navigate to All-in-One WP Migration > Import.
- You will see a section usually labeled "Import from server" or simply a list of backups found in that folder.
- Select the file and click Restore.
This bypasses the web server's HTTP upload limits (the most common cause of failure) and relies on direct disk I/O, which is significantly faster and more reliable for 100GB files.
Step 1: Locate the Constraint File
Navigate to your plugins folder:
/wp-content/plugins/all-in-one-wp-migration/constants.php
Solution A: The "Localhost Relay" Method (Highly Recommended)
This is the most reliable method for 100GB+ sites. It bypasses unstable internet connections and server timeouts by using your local computer as a processing hub.
Procedure:
- Local Environment: Set up a local server environment (e.g., LocalWP, XAMPP, or MAMP) on a powerful computer with ample RAM (16GB+ recommended).
- Configure
php.ini: Edit the local PHP configuration to allow massive limits:
upload_max_filesize = 120G
post_max_size = 120G
memory_limit = 2048M
max_execution_time = 0
max_input_time = 0
- Import Locally: Import the 100GB backup into your local WordPress instance. This is fast because it uses local disk I/O rather than internet bandwidth.
- Export Clean: Once running locally, use a different migration tool (like Duplicator Pro or WP Migrate DB Pro) to push the site to the live server, OR create a fresh All-in-One WP Migration export (which will be optimized/cleaned) to upload via FTP/SFTP.
Solution B: The "Unlimited" Extension + CLI Import
If you must import directly to a live server, you cannot use the drag-and-drop interface. You must use the CLI (Command Line Interface).
Prerequisites:
- All-in-One WP Migration Plugin.
- All-in-One WP Migration Unlimited Extension (Paid).
- SSH Access to the destination server.
Procedure:
- Upload the 100GB
.wpress file to the server via SFTP (FileZilla/WinSCP) to bypass HTTP timeouts.
- Move the file to the specific import folder (usually
wp-content/ai1wm-backups/).
- Do not use the browser. Connect via SSH (Terminal/Putty).
- Navigate to your WordPress root directory.
- Run the import command via WP-CLI (if supported by the extension version) or use the server's internal cron job to trigger the import script manually.