Possible to Restore from Backup of an Older Device?

I'm planning to get an iPhone 6/6 Plus, eventually. When I do, I want to avoid the hassle of having to re-download apps, reconfigure accounts, and re-tinker with settings, etc. I currently have an iPhone 4S that has all the apps/settings I prefer. If I backup the iPhone 4S, can I restore that backup onto the iPhone 6, or would that cause issues?

Not sure if anyone has done this after getting a new version of an iDevice. Thanks in advance.

 

Good to know, thanks.