SharePoint Online site backup ?

[pclermont]

Hi,

I have just read the following discussions:

• Sharepoint Online - Site backup / export 
• SharePoint Online Backups

I need for my business to backup sites but by programming, so it is not possible to use any

Third party tool.

This is what I would like to understand and know:

1.  In the previous discussions, it is stated that Third party tool should be used, but how do these products work then? It is that this is technically possible! Does Microsoft provide some specific apis or private access only to partners (ISV)?
2. I would like to be able to generate a backup file (CMP :( I was able to generate this file in SharePoint Server 2019 environment using C# code (as if the file had been generated using CA or PWS).  Is it possible to do the same thing on SPO?
3. I have just read Office 365 Migration Api using C#: If I understand correctly, it is only possible to import into SPO, it is not possible to export as well?

Thank you for your help.

[#2]

1. Microsoft does not provide backup APIs. Existing backup tools rely on SPO and Microsoft 365 APIs (Graph API)
2. In SPO you cannot achieve the same you can do OnPre.
3. Correct