Here’s an interesting, true-to-life story about the "All-in-One WP Migration 100GB Fix" — a saga of frustration, creativity, and a single line of code.


Step 4: The "Import" Side (Restoring the 100GB File)

Method B: Direct File Upload (More Reliable)

Instead of uploading through the browser, upload the .wpress file via FTP/SFTP to the backup folder:

  1. Upload the .wpress file to:
    /wp-content/ai1wm-backups/ (create this folder if it doesn't exist)
  2. Set file permissions to 0644.
  3. Go to All-in-One WP Migration > Backups in WordPress.
  4. The file should appear in the list. Click Restore.

The Deep Dive

Frustrated, Priya opened the plugin’s code. She wasn’t a developer, but she could read PHP.

She found the export class: class-ai1wm-export.php. There it was — a chunking system that split the archive into 10MB pieces to avoid memory bloat. Clever, but painfully slow.

Then she saw it: a filesize check in class-ai1wm-http.php:

if ( filesize( $file ) > 100 * 1024 * 1024 ) 
    throw new Ai1wm_Error( 'File exceeds 100MB limit for chunked transfer.' );

A hardcoded 100MB limit per chunk before sending to the server. That explained everything. The plugin was designed to reject any chunk >100MB — but her archive’s metadata file alone was often 120MB after compression.

No wonder it failed.