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Hi DannySmith007,
According to your description, you want the users to have the permission to sync files from site and not to delete the files.
You can do it by assigning the library permission to the users. Please follow the steps below:
1. Navigate to the site you want to share with the users, click gear > Site settings > in the User and Permissions section, click Site permissions.
2. Click Permission Levels in the ribbon.
3. In the opened page, click Edit.
4. Scroll down to the end of the page > click Copy Permission Level > type in the name, for example: no delete > uncheck the Delete items from a list and documents from a document library > Create.
5. Then you can assign your users the permission no delete for the library. Go to the SharePoint library, click Library in ribbon > Library settings > Permissions for this document library.
- Click Grant Permissions in the Library Permission page. In the share page, assign the user permission which you created.
7. Then the user can sync files to local, but they can’t the delete the files in SharePoint Online library.
For your reference:
Edit permissions for a list, library, or individual item.
Understanding permission levels in SharePoint
Regards,
Linda