Preparing data for migration can involve several steps, each of which has unique caveats depending on your environment:
- Review and update any filenames and pathnames that are not compliant with SharePoint Online.
- Determine whether any data isn't a candidate for SharePoint Online (such as prohibited file types or extensions).
- Review metadata and taxonomy configurations.
- Back up any customizations that may need to be manually deployed.
- Back up any site templates and site customization scripts.
- Review currently deployed third-party apps or plugins that need to be upgraded or replaced.
- Determine an action plan for any plugins or apps that haven't got a replacement or upgrade path.
The steps to prepare source data will vary based on your environment. Most organizations will have to go through exercises to identify content that needs to be modified or updated in some way to transition smoothly to SharePoint Online.
SPMT, as well as many third-party tools,...