I have been using QB since the days of Dos.  Data file size has never been an issue. 

Using QB Pro 2017 my data file (saved) was 194,740 KB.

When I had to buy QB Pro 2020 (because Intuit forces Payroll Subscription customers to "update every 3 years) my data file was 198,664 KB.  So QB Pro 2020 can NOT handle an additional 3,924 KB?  Total nonsense. Total Gaslighting!   And, ever since QB change the login feature its been a very slow connection and very slow to handle Merchant Processing. 

Plus some foolish people in Intuit now force you to have your customers fill out a PDF form with all or their CC information and the customer has to email it back to you just so you can type in the same information in QB to process?  So, suddenly QB Pro is not a safe place to store CC information?  Suddenly emailed imaged documents are more secure and QB Pro with all of its log-in and password requirements that you have to change every 3 months?    All that nonsense of emailing forms back and forth, storing the printed documents in locked file cabinets in locked rooms, etc.  Might as well use another CC processing company other than Intuit.