How does canister stable memory really work?

Developers
1

Does the canister stable memory only work during canister upgrade to store the actor variables data and then restore the data after upgrades to the heap memory?
Is there a way I can store certain data in the stable memory and then use it in the heap only when I need it?
Thank you.

2

if you’re using rust, then you can do that using ic-stable-memory

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