[jdege]

I don’t see anything about its incubation period.

Does it infect the files, then immediately start demanding ransom? Or does it infect the files, and then wait a few weeks so that your current backups will be infected, as well?

If there’s no incubation period, I can’t see how this is any worse than a HD failure - just restore from backup and carry on.

(If you don’t have automated backups running at least daily, I’m sorry, but you truly are too stupid to be running a computer.)

[Windflier]

I don’t see anything about its incubation period. Does it infect the files, then immediately start demanding ransom?

Yes. It also starts a 100 hour countdown clock at the same time. If the infected user hasn't paid up by the time the clock elapses, the key is thrown away and the files are essentially lost forever.