By default, the Noah 4 Backup Scheduler is set to back up your Noah database automatically. The backup will proceed even when Noah 4 is in use, and if the computer is shut off at the scheduled time the backup will complete upon boot up. The backup files are stored at C:\ProgramData\HIMSA\Noah\Backup\Database (Older Noah versions stored the backups at C:\Program Files (x86)\HIMSA\Noah 4\backup).
These automatic database backups have saved the day many a time when a location had not thought to perform regular backups, then had a computer problem, and discovered that Noah was taking care of the backup for them!
The backup files do accumulate however, and if you have a large database, the weekly backup files can consume significant hard disk space over time. Periodically remember to check the backup folder and delete older files.