I have an on-prem (2013) site with 200+ subsites all created from the same template with the same document library just because users wanted to re-use the same filenames (and document library names) for different suppliers.

So 1 site for each supplier with a portal site with hyperlinks to the subsites on top.

Since we decided to phase out our on-prem environment this site will have to be migrated to SPO.

Is it wise to move this behemoth of sites to O365 just as is? Or is their a better restructured alternative I'm missing? I'm curious about the experts experience on this or if others have experienced a similar migration.

  • given the fact that SPO is Site Collection centered(given the functionalities by the hubs), i believe your best bet is to restructure to a Site Collection-wise deployment.
    – jimas13
    Aug 5, 2021 at 12:34

2 Answers 2


SharePoint hub sites help you meet the needs of your organization by connecting and organizing sites based on project, department, division, region, etc. making it easier to:

  • Discover related content such as news and other site activities
  • Apply common navigation, branding, and site structure across associated sites
  • Search across all associated sites

SharePoint administrators determine how many hub sites can be created in your organization, who can associate sites with each hub site, and whether associating a site to a hub requires approval.

Therefore, we recommend that you reorganize the site structure because it is not advisable to have too many subsites in SharePoint online.

You can read "Planning your SharePoint hub sites" articel to plan your enviroment.


Considering SPO where you have hub site concept I would suggest you re organize the sites. Not good to have so many subsites.

Read more about Planning your hub site. https://docs.microsoft.com/en-us/sharepoint/planning-hub-sites

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