you'll be just fine. a day or two of lights out is no big deal. i've dealt with several power outages and had no issues. the only problem is if i'm not home when it happens and the timers get all out of whack when it comes back on.
the main thing with photo plants is not to disturb their night time. the lights can be off for days and they will be ok. but if the lights start coming on during their night time, they may freak out, depending on how sensitive the strain is and how long this occurs.
with autoflowering plants, a lot of them can deal with 24/0, so the cycle getting off isn't as big of a deal, you may just lose a little growth while the power is out. just get them back on the same light cycle and you should still be fine.
don't scrap the grow!