There are important items to do before you take a project Live.
Day and time to push your project Live. What time with have the least downtime, and is practical for publisher.
Mark sure all backups are done, for both files and database, and be sure the backups are good to restore if necessary.
Several of the hosting backups are good and reliable, and so are the platform specific backup solutions.
There are differences with hosting and backup solutions, platform specific solutions can be configured to backup only the specific project, this can save on file store space and speed to restore.
Publish the new project after testing, review, and verification with site owner.
It is recommended to do a backup before any testing.