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If you need to switch from Magento to Shopify, it's better to leave it to professionals with a lot of experience, so that definitely nothing happens to your business data or anything else.
If you're serious about migrating from one platform to another, learn more about Amasty specialists. I haven't had any experience with migrating an online store, I'm working on Magento and I'm happy with everything so far. But all the tools, extensions, plugins, including omnibus cost, which I now use in my work, are developed by Amasty company, so I am more than confident in the level of specialists and the quality of their services.