What are the options to store user data temporarily (general web development)

The Idea is to enable the user to input information before actually signing up (like testing an 'add article'-function).

The server needs to remember this for a while (a couple of days) and then discard / implement it into a live system depending on how registering goes.

That data could be stored

• in a database
• in sqlite
• textfiles
• List item
• in a session
• in redis?

What are other options and where are the benefits & drawbacks?

This is very basic and since there is a lot of movement in the market I'd like to know whether I miss anything + choose a fitting option.