SharePoint-to-OneDrive around 1TB Migration keeping a local copy

I have several large folders on SharePoint Online—about 1 terabyte in total—that I need copied down to a local drive and then uploaded into OneDrive. Only specific folders are involved, but every historical version of every file inside them must come across, so nothing is lost along the way.

Here’s the workflow I expect:

• Pull the selected folders (all versions) from SharePoint Online to a local drive I supply or you provision.
• After verifying file counts and sizes locally, move the same folder set into my OneDrive account, keeping the entire SharePoint structure intact beneath a single top-level folder.
• Leave the full local copy in place as a second backup when the OneDrive upload is finished.

Because I’m an owner / admin for both the SharePoint tenant and the destination OneDrive, I can grant you whatever permissions or temporary global roles you need.

Delivery is complete when:

1. OneDrive shows all folders and versions with matching counts to the source.
2. A checksum or report demonstrates integrity between SharePoint, local copy and OneDrive.
3. You hand off a concise migration script or procedure notes so I can repeat or audit the job later.

If you have handled multi-terabyte Office 365 moves before and can finish this with minimal downtime, let’s get started.