Anyone have more than two environments?

Summary

more than two environments

Content

Hi. Does anyone have a need to keep an application static for a while but still have an application kept up to date for continuing closes? We want to keep, say, the December 2018 application as it is - no changes - for year end reporting and reference and still make changes effective for January 2019 close. In HFM we would just create a copy of the application on the same server environment and could keep it there for as long as we wanted.

We can think of three ways (listed below) and wondering if (a) which of these do people do and (b) if someone else have come up with a fourth option.