We’re considering a move from Google Workspace to Microsoft 365, and one question that keeps coming up is how to protect the existing data before changing platforms. It’s easy to focus on moving Gmail accounts, but there is usually much more involved than email alone.
For example, users may have important files in My Drive or Shared Drives, years of Gmail conversations, contacts, calendars, tasks, and Google Chat data. If the migration is performed in large batches, keeping track of what has already been transferred can also become difficult. I’d rather have a backup available before making any major changes to the source environment.
I’ve been researching how organizations migrate Google Workspace to Office 365 and one thing that seems important is having proper account mapping. Source users may not always have the same addresses as their Microsoft 365 accounts, so manually matching every account could become time-consuming. Batch mapping would be much easier for a larger organization.
I’d also want the migration to handle duplicate data sensibly. If a job is interrupted and needs to be resumed, starting the entire migration again could create unnecessary copies and increase processing time.
The SysInfo Google Workspace Backup Tool is one option I came across during my research. It supports migration of Gmail, Drive, and Chat data to Microsoft 365 and provides CSV mapping, date filtering, duplicate handling, and resume migration options. It can also save Workspace data to local formats such as PST, MBOX, PDF, and CSV.
Another point I found useful is that the product supports local processing through Google and Microsoft APIs. For a business handling confidential information, I would definitely want to understand how credentials and data are handled before selecting any migration solution.
I’d probably run a pilot with a few different user accounts first, including users with large mailboxes and substantial Drive data. After that, I’d compare the source and destination before moving the next batch.
For admins who have already completed this type of migration, did you create a complete backup first or migrate and back up at the same time? And were there any unexpected issues with Drive files, Gmail labels, or user mapping?
