Writing to the future, deferred execution: is there a reliable way?

Question

Email

It is necessary to charge a certain task for execution in N years. For example, send an email. email or pull a webhook.
What are the solutions for this today? Considering that a web service offering a similar one may close in a couple of years, Ethereum will get bored and die out due to the appearance of a convincingly superior solution, hosting will break, the data center will burn.

Answer 1

reliable no
asteroid will fall and there is no letter))

Answer 2

Save the task to cron on the very system on which you will need to perform this action. If the system survives these N years, the task will be completed.