Is there a way to copy my store so that I can test an app? A sandbox store?
There’s not an easy way to make an exact copy of your store – you’d have to complete a full migration.
https://help.shopify.com/en/manual/shopify-admin/duplicate-store
However, depending on the app, you probably don’t need to make a full copy of your store.
You can definitely make a duplicate copy of your theme (so that if the app adds any coding, and then you remove the app, you can easily revert to the previous/duplicate copy of your theme).
https://help.shopify.com/en/manual/online-store/themes/managing-themes/duplicating-themes
As far as a test environment goes – if you sign up for the Shopify Partners program (https://www.shopify.com/ca/partners) then you can create a “development store” that you can use to play around and test things (separate from your actual store).
https://help.shopify.com/en/partners/dashboard/managing-stores/development-stores
You could create a dev store https://dev.shopify.com/dashboard/ and then copy your store with the help of AI Hero onto the dev store. Just install the app on both stores and then prompt “copy store onto store ”. Once all the data is copied, you can test your app.