Internet is mandatory to use QB Online.
Consider using QB Desktop if your internet is not reliable. You can still purchase a one time license of QB Desktop 2021 or 2020 with a lower price.
I can certainly share some details about accessing your data in QuickBooks Online, harsh5.
QuickBooks Online is a cloud-based program that can be accessed through the internet. We automatically back up your data using the same level of security used by banks and financial institutions.
If you'd like to access your data offline, you can use our desktop version. This program offers a service that''ll automatically back up your files.
Additionally, I've included this article that'll help you download your data from QuickBooks Online. This helps you have a handy copy of your file: Export Data, Reports, Lists, and More.
I'm only a few clicks away if you need assistance with your other QuickBooks tasks, harsh5. It's always my pleasure to help you out again.