SAP DB changing the Log mode to the "Owerwrite mode is ON"

Hi!

I would like to know, which consequences do I have, changing the Log mode to the "Owerwrite mode is ON".

Is that comparable with Oracle's archive mode?

What should I note proccessing so (e.g. to make back up)

I don't use the system in productive mode and would like to save/spare free space on my server....

Thank you very much!

regards

Axel