I have an 2011 QB program. My back up files have extension of .qbmb I cannot import these files into QB Simple start which I purchased. What can I do?

You can use the trial version of QBD 2012, 2015, 2018, and 2021 to upgrade your data gradually and convert it to QBO Simple Start. Contact me in private and we can share the trial codes. Otherwise, we can help to convert your data directly to QB Desktop 2021.

How can you convert it for me?  this other process seems cumbersome.

@pwehde-mac-com 

Click on my profile name and you will find our website address to send an email to. We can help to convert your data directly to QB Desktop 2021 and you can convert it on QB Online later.

I see that you're having difficulties importing your backup files, pwehde. I'm here to help you with this.

You can follow the suggestions by 4Gal and Fiat Lux - ASIA.

Meanwhile, your backup files are in an unsupported format, so you cannot import them. To successfully proceed, I recommend using a converting tool to convert your file. 

These are the file formats supported by QuickBooks:

• CSV
• XLS/XLSX
• Google Sheets

For more detailed information, check out this article: Common questions about importing data. 

Furthermore, if you have a customer or vendor list that you'd like to bring into QuickBooks Online, you can import these as a spreadsheet from Outlook, Gmail, Excel, or Google Sheets. 

Kindly tap the reply button if you need further help importing your file. I'm always here, ready to lend a hand.