Next we will change the backup window to 22:30 (UTC) and set the backup retention to 3 days.
In the upper right of the database details screen choose the Modify button
On the Mondify DB Instance page, scroll down to the backup section which is under “Additional Configuraiton” section. Using the pull down menu change the backup retention period to 3 days. The maximium retention period for automated backups is 35 days. Manual snapshots can be retained indefinetly
Update the backup window to occur at 22:30 (UTC), so plan accordingly
Once you’ve made the appropriate changes click the continue button. Confirm the modifications on the next screen and choose the Apply immediately option. Click Modify DB Instance
As the changes are being applied you’ll be taken back to the database instance details page. Note: the exact start time of the backup will be chosen at random within the 30 minute window.
Alternatively you can modify the instance’s backup window using the AWS CLI as shown below:
AWSREGION=`aws configure get region`
aws rds modify-db-instance \
--db-instance-identifier rds-pg-labs \
--preferred-backup-window 22:00-22:30 \
--apply-immediately \
--region $AWSREGION