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As I known, we must backup and restore state into multiple microstacks
Then delete unused ones?

1. Use `pulumi import` to import resources into a new stack (and generate corresponding code).
2. Use `pulumi state delete` to remove resources from state in the old stack. Update code to no longer create those resources.
3. Verify that `pulumi up` behaves as expected for each stack (old and new), adjust code as needed.

very bad idea to import thousand of states :face_holding_back_tears:

It is possible to use `pulumi stack export` to get the state (in JSON), modify that, import it back in to a new stack with `pulumi stack import`, and then follow steps 2 and 3 from above. However, we don’t generally recommend this process.