That is simply the instructions for setting it up, which I have already done.  It is not deleting the files over 5.  It just keeps adding them.

As to needing to be in single mode:  Here is a response from another QB employee.

"You can use either Multi-user or Single-user mode in creating data back-up in your account because both of these modes have a task or feature to completely back up the file. For more information, you may visit this article: Features available and tasks you can perform in single or multi-user mode."

Link to this post: https://quickbooks.intuit.com/learn-support/en-us/other-questions/re-multi-user-and-backups-quickboo...