I'm here to provide some insight about creating a date specific backup copy of the company file.
To clarify, is your client trying to create a regular backup or an accountant's copy? At this time, QuickBooks doesn't have an option to specify the amount of data backed up based on a date range. For more information about this, I recommend following these articles:
I can see how well this option would work with QuickBooks Desktop. If it's a feature that your client deems as necessary for their business, I highly encourage them to send feedback directly to our Product Development Team. Here's how they can do that:
Click the Help menu.
Select SendFeedback Online, then Product Suggestion.
Follow the on-screen instructions.
Keep in touch if there's anything else I can do for you. I always have your back and am always happy to help. Thanks for reaching out, wishing you and your client all the best.
They can also use this link to send feedback using a browser: