Here's how you should receive your daily inventory report:
In your Ecom page, go to Account Settings>Inventory Backup and change that to YES, then save changes.
Once set up, you will then start to receive a back up CSV file of your listings through Email daily. Inventory Backup Emails are processed at midnight (PST).
Please make sure you are receiving your back up CSV file in case you delete your listings.
If you are not receiving your Daily Backup CSV file please check your spam folder on the basis it might have been sent to your spam. If you still don't find it under your spam folder, please contact your friendly Support Team for further help.