I will clone the ssd to the second ssd and to a 4gb western digital hdd.
But why?
I only backup data that I can't easily download again
And if OP also have fast internet connection, re-download Bitcoin blockchain from zero would take about a day or less.
and if you make it a "hot clone", software glitches mean you lose all data on both drives.
I doubt glitch would make you lose data on both drive since the software supposed to perform read-only operation on 1st device, unless the software is badly written.