I have had three bad back tweaks while doing highish (8-10) reps of deadlifts in several years of training. These take about 4-6 weeks to get back to squatting or deadlifts without pain. And probably a week or so just to walk without pain.
I gave up high rep deadlifts, but I still do high rep paused, RDLs, or any other variation.
Lately I added weighted back extensions on a GHD or Roman chair along with my twice a week core training, with the potentially naive belief that direct training of my lower back will somehow help prevent further tweaks.
Am I just waisting training time?