Hi, Werner

Not to belabor the point, but if the system sees a file is to be
saved with the same name as one already 'in situ' it asks if you
want to 'write over' the earlier file. I first became aware of
this when it seemed to spoil my status prompts.

Your idea allows making backups unique wrt DAYs. Making several
in a given day I still observe this phenomenon. I might prefer
to swap YEAR for HOUR, retaining the same brevity but allowing
for more changes per DAY of the medium.