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Hi @Twinkle Chatterjee ,
"SavePageAsDraft" endpoint won't override the minor version, it just make the site page exist the edit mode and save the current changes for the page into draft.
In fact, when user Click "Edit" button in the page, the page has already generate a new minor version, you can check this point in the UI.
If want to use Rest API to generate the new minor version, you could do a check out action for the page, then it will also have the new minor version, as before editing, the page need to check out firstly, in the same time, the new minor version created:
/_api/web/GetFileByServerRelativeUrl('/SitePages/TestPage1.aspx')/CheckOut()
Thanks
Best Regards
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