Export a backup (AdWords Editor Archive)
As with the other exporting options, you can save a snapshot of the entire account or select specific campaigns and ad groups. The backup is stored as an AdWords Editor Archive (AEA) file, which you can import any time in the future. AEA files include unposted changes, comments, and draft campaigns. In addition to the manual backup option, AdWords Editor automatically saves a backup of your changes when you re-download an account with "Get Full Account," or when you select the "Backup then Update" option during a version upgrade. These automatic backup files always contain the entire account, including unposted changes and comments. When you import a backup file, the parts of your account that were archived are restored to their previous state.
Export an AEA backup file
Go to the Account menu > Export > Whole account > AEA.