Question 3 of 6

Does it need to remember anything?

Persistence is optional. “Cloud” and “shared” are different. A URL can be a save file.

No Refresh may forget. Fine for calculators, explainers, and most marketing pages.
Yes, but only on this device A file, localStorage, SQLite on disk. Other computers do not know.
Yes, in the cloud, just for that person They expect to log in on a second device. That is already a backend.
Yes, shared between people Now you have contention, permissions, and backups you actually mean.