- 1 year
- Unlimited
- 30 days
- 60 days
The correct answer is: 60 days
Explanation: Data Transfer files older than 60 days are purged from Ad Manager. If you would like to store your files for longer than the allotted 60 days, we recommend that you either store the files locally or move to a permanent cloud storage solution, which can include an independent Google Cloud Storage account over which you have full control.
Read more here: https://support.google.com/admanager/answer/1733124