Assuming you have deadlifted consistently for some time and are familiar with the required form there is no issue lifting your back. The vast majority of people deadlift much more than they squat and the incidence of injury during a squat is marginally higher than that of the deadlift (link below).
This is untrue for the untrained lifter as they will arch their lumbar spine without stabilizing it, injuring themselves.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6059276/
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