History Logs provide history of all edits made to a calendar by any user with Edit Rights to the Calendar. With the history log you can protect Calendar data with real-time backups and recover a deleted Calendar entry.
Not only does the Audit Log record who made what changes to your Calendar, you can also review the Audit History online and download the Audit Log directly to your computer. When you download the Audit Log for any Calendar in your account, you can maintain a permanent storage or backup of the Audit Log stored on your computer.
How to export a Calendar’s Audit Log
The exported file will be in a .CSV format. This is a standard file format that will be read by any spreadsheet program, such as Excel.
Learn more about the Audit History Log.