Failed to connect: Unable to save schedule or backup object: Could not find a part of the path "/private/tmp/PKInstallSandbox.ibt4gh/tmp/dup-0dfacd39-04bd-4075-9262-34df342a6dfd".
This is with version 2.0.4.5_beta_2018-11-28.
Apparently this was fixed by a reboot, though I’d still consider this a bug. A reboot shouldn’t be necessary to start a restore after installation.