Encrypted data without the password can't be restored. If you have the original backup plan that was used to transfer the data to the cloud you'd need to open a support ticket and explain the situation. Can't guarantee that data will be 100% restored, especially if you also changed the password previously, but that's the best way to try and restore your files.

Hi ...
Original back up plan means i could not get...That system was fully crashed by ransomware.
Please help.me to restore the data atleast partially

Without encryption password and the original backup plan the is data unrecoverable, so there's nothing we can help you with.