Hi Stephen,
For a double check, do you have any configured jobs regarding backup/restore.
And also, could you share the pgAdmin log file after following the below steps.
1) Launch pgAdmin.
2) Goto File->Options->Logging.
3) Set the desired the log location and select "Debug Mode".
4) Close the pgAdmin and relaunch it.
5) Once it relaunched, please upload the log file to this thread.
Thanks in advance.