Follow the steps given below to take a backup of your Quicken Online.
Click on Edit and go to Preferences.
In the preference window, select Backup. Here you can set the frequency of your automatic backup and the number of backup copies that need to be made at a given time.
Click on OK to save the changes you have made so far.
If you want to create Quicken Online Backup manually, then refer to the below steps.
Click on File and go to Backup And Restore.
Click on Backup Quicken File
Select the location for your file where you want to save it. You can backup your data to the system storage, cloud storage, or external memory.
Click On the Back up Now button.
Once the Done confirmation will be prompted to the screen, do not exit.
https://www.quickensupporthelpnumber.com/quicken-online-backup