Lets say your a hero, you've had quite the career and are level 14. You've infiltrated the BBEG's capital city and know that within the next two-weeks, you'll do battle and only one person will walk away.
While you're impressive and all, the BBEG is a legendary kingpin of power, he's like you, but stronger, faster, and more potent, and when you consider the odds, you find them not to really be in your favour.
That said, you're too proud to let nearly certain death stop you. You're prepared to die, but not ready to stop. Brave enough to do your duty, but not so stupid as to want to cut your life short.
You'd usually have Contingency: "When I cast Feather Fall, Dimension Door to the entrance of the castle" or somesuch, but here you're completely cut off from any "safe places" and home is a long way away. Assuming 7th level arcane spellcasting, and about 2 weeks with nothing but 50,000 gold, with no friendly cleric or church in sight,how would you ensure that death need not be the end?
I considered clone, but the lab and time requirements make it unfeasible for our hero behind enemy lines.
Simulacrum as a way to "continue the legacy" would allow for a less effective "you" that would be going nowhere in life.