When you are determining which systems to use for logical replication, there are several key considerations.
These considerations are:
If your system fails over, you need to know what data and applications you have running on your primary system and your backup system. You want to put the critical data on the system that is most capable of handling the workload in case it fails over. You do not want to run out of disk space. If your primary system runs out of space and fails over, it is highly likely that your backup system is also going to fail over due to lack of disk space. To ensure your data center is not completely destroyed in case of a natural disaster, such as a flood, tornado, or hurricane, you should locate the replicated system in a remote location.