For a successful migration from SharePoint 2016 to Online, it's essential to develop a detailed migration plan and prepare adequately before the migration. Check the audit log for modifications, utilize tools like Sharegate to avoid errors, and know the steps to take after migration to ensure everything runs smoothly.
During the migration the site can't be locked if you are using Sharegate, there is a chance that employees will ignore the instructions in the ribbon and still make changes.
Furthermore, they might also be automated processes that are putting records in your old SharePoint Server.
So to ensure the migration process did not miss any items, ensure nobody modified documents on your old Intranet SharePoint Server. To do that:
At a high level, the plan is:
Even if you get rid of unsupported content before migration, your first dry-run migrations are very likely to include errors. Here are the most common errors and how to fix them.
There are certain features in SharePoint on-premises that are no longer supported with SharePoint Online.
If you migrate using the Sharegate migration tool, you want to have zero errors in their reports. To do so, here are what you should do before considering migration:
Before migrating your content over SharePoint Online, you want to get rid of unused or old content. Migration is the perfect time to audit your content and delete what you can. You may also use the migration to identify (and get rid of) Orphan Users, and Documents with Custom permissions (look for SharePoint best practices on permissions).
Although Sharegate migration tool works very well to help you with your SharePoint migration, some manual steps might be necessary to complete the migration. These extra steps include: