In case if we wish to discontinue to renew subscription of QB, then will we have viewing access in future?

Hello there, @stany-mendonsa.

Thanks for visiting the Community. Yes, QuickBooks Online (QBO) will hold your file for a year after you cancel your subscription and will allow read-only access. For more information about data availability and export policy after cancelation, read through this help article: What happens to my QBO data after I cancel?. 

Here's an additional resource in case you'll need to come back in the future: How to resubscribe or reactivate QuickBooks Online. 

I'm always around here to answer if you have more questions. Have a great day. 

@stany-mendonsa 

As for additional backup, convert your data to QB Desktop file with this app (free for limited time)

https://www.exportmybooks.com/