Here in Gilroy (southern end of the Bay Area) we get one or two outages a month during the summer. Unless it's a planned rolling blackout due to heat, they're usually only a few minutes in length, at least. The Costco-special UPSes I use (CyberPower 1350VA units) have all proven adequate for keeping my work/compute infrastructure online.

I've got solar, though, and a house battery is very much on the list once my budget allows it. I don't see local system stability getting better any time soon, and likely worse now that PG&E has more leeway to shut down power during wind/heat events and the like.