Data Transfer between two online Dynamics 365 trial instances by custom code

Hi,

Is it possible to send all the account data created in one "online dynamics 365 trial instance" to another "online dynamics 365 trial instance" by using custom work flow?

Data should flow on creation only, if it already exists in the target system, it should be updated on updation in the source system.

Apart from  custom workflow, is it possible by any other way?

Thanks

Amit Kumar Rath