The database has died, how to recover lost data?

Question

MongoDB

During the week, the NodeJS + MongoDB server that people used was running on the computer. Today, after a BSOD and reboot, all the data for the week, as well as the database users and their roles, were deleted.
Is it possible to recover lost data?
What have I done wrong?
And how can this be avoided in the future?

Answer 1

From backup.
Now you will do it.