Rails itself will take care of your criteria 1 to 5. However, you need to spend a few more effort to export data from database and save it as a text file. You may also use devise as a better solution for authentication (criteria 2) and Simple Form (just google simple form rails. Sorry I don’t have enough reputation to post more than 2 links) to handle forms more easily (criteria 3).
If you are new to rails, I recommend you to read the first few chapters of Agile Web Development with Rails or this online tutorial.
These will also cover your issues 1 to 3. For issue 4 you could use whatever (mysql, postgresql, sqlserver, etc.) you like as the database, you can choose rails build-in web server (webkit) or thin as a server for development; for production app, you may use a combination of apache/nginx and passenger. These are just a few suggestions. Of course there are more options out there. Choose what fits you best 🙂
Since your question is too broad, I can only post some resources to help you start. Check out the tutorials first until you get the hang of rails. Then check out other gems which could save you tons of time and could also help you build a more robust system.
solved Online record system [closed]