You should be able to back-up unless you are using an older version of QBs whereby on-lines services are no longer available. Even with older versions, you can still back-up. Use a USB and when asked where to back up, navigate to your USB port.
If you're getting the same result, let's check if the Windows firewall isn't blocking IDP to access files. Here are the steps you need to do:
Add important files
Press the Windows key on your keyboard, then type Firewall in the search field.
Click Allow an app through Windows Firewall, then Allow another app.
Select Browse, then go to Program Files(x86)\Common Files\Intuit\Data Protect.
Hit QBIDPservice.exe, then Open.
Select Networktypes, then mark the Private box.
Repeat steps 4 and 5 for the files IBUenghost.exe and IntuitDataProtect.exe. If you get a message saying the files already exist, you’re all set.
Add Intuit Data Protect to your trusted sites
Press the Windows key on your keyboard, and type Internetoptions in the search field.
Select Security, then Trustedsites.
Click Sites and add the following websites: a. backup.com b. *.intuit.net c. *.intuit.com d. *.intuitdataprotect.com e. *.quickbooks.com f. workplace.intuit.com g. emerald.backup.com (a new trusted site that update your IDP certificates).
Uncheck the Require server verification (https: ) for all sites in this zone.
If you're getting the same result, you can perform other troubleshooting steps by going through this link: Can't back up with Intuit Data Protect? This article provides other solutions so you can continue backing up your file using IDP.
Let me know how everything turns out by leaving a comment below. I'd be glad to help you out.