ACP automatically creates new Act! database backups every night. You can access the backups for an Act! database by clicking the last backup widget on the database dashboard. This page list of recent backups and options for database Backups. 
At the top right of the Act! Database backup screen are three tools 
To create a new Act! backup, Click the plus sign, this will prompt you for what kind of backup you would like to create.
You can manage backup options by clicking on the wrench 
To restore from a previously created Act! backup, click the restore backups tool.