Hello lelieee,
Thank you for reaching out to the Microsoft Community. My name is Raymond and I'm happy to help.
Whether to use OneDrive or not is dependent on your needs. I have attached a few articles that will better help you understand OneDrive features and if you need it.
See article '15 reasons to love OneDrive' by Ankita Kirti from Microsoft Tech Community: https://techcommunity.microsoft.com/t5/microsoft-onedrive-blog/15-reasons-to-love-onedrive/ba-p/3592495
Also, see 'benefits of OneDrive' from Microsoft: https://adoption.microsoft.com/files/onedrive/Benefits-of-OneDrive.pdf
Please let me know if you need more assistance.
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Regards