Determine your needs, decide what needs to be migrated and choose the best method based on the number of files to be migrated.
The number of files and the file sizes can help you pick the best method.
Best suited for less than 1GB of content. Use Firefox, Chrome, Internet Explorer 9+, Safari, or any browser that supports HTML5.
Upload up to 500 files at a time.
Migrate up to 100,000 files at once. Increase your number of simultaneous downloads to maximize speed and stability.