In this document the archiving process of Event Managament data with archiving objects SAPTRX_EH and SAPTRX_EVM is described.
It also describes how you can display archived data on the SAP EM Web UI.
very well drafted article..
very good abstract of EM Archiving.
I'd like to add something because we've had problems with the table /SAPTRX/AOTREF in our application system. If you don't need/ or use the confirmation from the EM-System the EM-Archiving doesn't delete the entries in the above table via archiving/ deleting.
Therefore you have to implement two SAP Notes 2228613/ 2228615 before the first archiving 🙂 .
If there is an other way to avoid entries in /SAPTRX/AOTREF please give me a hint.