Time Machine hanging after deleting big files
A couple hours ago I deleted upwards of 70GB of files from my HD by cleaning out some huge Final Cut Pro libraries from completed projects. I was down to 28GB on my 1TB SSD drive and now the Finder window tells me that I have over 105GB free. I'm trying to make a new backup in Time Machine but on repeated attempts, TM stalls/gets stuck and goes no further. Currently it's been stuck at "Backing up 383.3 MB of 9.86 GB." Any guesses as to what's happening?
Thank you...
MacBook Pro 15", macOS 10.15