What do people do to minimize downtime when upgrading/maintaining  a
live site ?

Ideally the steps should be:

1. install the new version into a separate app directory and database.
2. somehow test the installation is working
3. switch over from the old app directory and DB, to the new app
directory and new DB.

For this process to work, you need a way for existing users to
continue seeing the old site, while you see the new site for final
setup.

Alternatively, a less ideal method is:

1. set site to "down for maintenance"
2. upload and replace your app directory
3. test to make sure it's working
4. put site back online.

This process also requires that users continue to see the "down for
maintenance" page, while you see the new site for final setup.

How have you approached this problem?
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