Hi,
If you only need the data (=backend) online (not the frontend), then you can do just that, i.e. export only your data to an online data server/storage like Azure SQL or Sharepoint, from where you can then link the tables back into your Access frontend(s). Check what is the best way for your application, requirements, amount of data, budget, knowledge, etc. There is a lot of information on the web, or get an expert to look at your application to find the best solution.
Servus
Karl