Scheduled automated deployments

Hi all [emoticon:c4563cd7d5574777a71c318021cbbcc8]

What is the easiest option these days to deploy specific applications between two environments (both cloud instances) daily and automatically and on a schedule? Preferably without downloading applications onto a server or an employees device.

We want to back up our applications from Environment A to Environment B daily at say 23:00 without manually doing a Compare And Deploy. 

What do you use?

Many thanks,
Uel