Initial backup stopped at 1%

I downloaded the files and was able to initialize the backup procedure. The backup then did not appear to run and it stopped at 1% which was 2GB out of 200GB its been hours with same info displaying. What do I do to get it working?

Let it run overnight and check again. Initial backup is quite slow.

my computer was set to sleep after inactivity. perhaps that was why it stopped backing up.