[Snapshot Pro] Snapshot Is Not Creating Backups

We are trying to create backups for our sites. However, we keep getting a "max_execution_time" error and a "php zip module not found" error. Please view the following screenshot for more details:

http://prntscr.com/lz364d

We would like to understand how to remedy the issue or how to get the problem fixed. We are unable to make backups for our sites.