several user accounts that include Gmail emails, Google Drive files, contacts, calendars, and other business data. There seem to be a lot of migration tools available, but it's hard to tell which ones are actually reliable in real-world use. I'm looking for something that preserves folder structure, metadata, attachments, and minimizes downtime during the migration. If you've completed this migration, which tool did you use, and how was your experience? Were there any issues with large mailboxes, shared drives, or data integrity? I'd really appreciate recommendations based on actual experience rather than just feature lists.