How to Migrate from SharePoint On-Premises to SharePoint Online?
Many users still using the SharePoint On-Premise are finding a way to migrate to SharePoint Online. However, the process of migrating SharePoint On-Premises to SharePoint Online is an Everest-winning task, but by having a reliable path, we can easily achieve our goal. So, for that, the SharePoint Migration Tool is very helpful because it has a lot of cool features that make migrating easy and quick. Also, users can move from any version of SharePoint (On-Premises or Online) to any other SharePoint setup.
https://www.shoviv.com/blog/migrate-sharepoint-on-premises-to-sharepoint-online/
How to use the SharePoint Migration tool?
Download and run the SharePoint Migration Tool.
Select SharePoint to SharePoint Migration and specify the source and the target.
Filter items and modify other settings. Click Next.
Schedule the job if needed and tap Finish.
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Ivy Fridde commented
I use a tool called Gs Richcopy 360 , it is the best