Store userdata online or offline?

[alegro96]

Question

I try to develop a web app to control smart devices. Therefore every user needs a specific list of devices that belong to him. This list contains e.g. the id, label, ip and some settings information for every device of the user.
Is there a way to store these data persistent on the users device without loosing them after e.g. the browsers cache is deleted?
I also thought about storing them online in any database or cloud service. Can you recommend any service that I can use for this case?

Code sample

No response

Error message

No response

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• I have searched for answers to my question both in the issues and in previous discussions.