I’ve been a satisfied user of UpdraftPlus Premium since 2016 and renewed my license in March 2020.
I updated to version 2.16.26.24 on May 23, 2020 and have had nothing but problems since.
After running for hours, UpdraftPlus would just quit working. I let it run overnight with the same result.
I’ve checked the forum numerous times for a solution, read through my log numerous times, checked my firewall, optimized my database, deleted and reinstalled the plugin and still could not isolate the cause of the problem.
Finally, out of total frustration, I deleted version 2.16.26.24 and reinstalled version 2.14.4.0 (untested on WordPress 5.4.1) now everything works as it should.
My experience would indicate the problems lie with update 2.16.26.24