How can I save map at runtime in Blueprints?

[Supremative]

You could implement it in the following way:

1. Create a structure to keep actor properties needed to save.

You can add other data to this structure, such as a static mesh, materials, etc.

2. Create a save game object blueprint and add some variables and functions.

3. Create a SaveActor recursive function

4. Save Event

5. Create RestoreActor recursive function

6. Restore Event

7. Add an “Ignored” tag to actors in your level to ignore them while saving.

Similarly, I implemented the saving of scenes in my editor:

Quiet Runtime Editor in Blueprints - UE Marketplace

Example Project UE5 (Contains blueprints from this post)