Power Outage and auto save fail

Wow! That is weird. Sorry you lost it! I know how frustrating that is after all your hard work. Were any other files affected on your computer? I'm also curious as to the frequency your Auto-Save is set to (not that this explains the disappearance since most are 20min or less intervals). I agree with Ann, a manual SAVE A COPY is excellent. I'm a nervous editor. I also will set my Auto-Saves location to Onedrive and/or Dropbox sync folder. This work great for me as my files sync very quickly--and if I lost my entire computer, I just restore my back media from my backup and grab my last auto-save from the cloud. I have actually found Onedrive to be super powerful and faster on my computer. I have 2 Tb of cloud space and use both After Effects and Premiere right out of the sync folder with massive success. Hope you recover something.

Instant Auto Save – Adobe video & audio apps

What Ann said and begin to do a manual Save (Ctrl+S/Cmd+S) along the way as well. Personally i do manual Save and Save a Copy often so power outage and crashes will in the worst case scenario cost me a couple of minutes of work loss.

I am on Windows and have mapped Save to the F12 key. When i have done something i feel that "i don´t want to loose this work" i hit F12. Daily backups, onsite and offsite, on top of that.

Bad luck!

Dont think you need to start over, just continue were you left off.

Make a habit of Save a Copy to another drive every so often.