Cannot backup with updraftplus on local host

I have developed a small wordpress site using WAMP on my pc to set up a local host. I have installed Updraftplus to test out my use of it before going “live” by exporting my site to an external host but cannot backup to Google Drive or to email. I keep getting the message “not finished” under Existing Backups and it tries again after about 3 minutes but eventually exits. I have tried splitting backups to as little as 25 Mb but that makes no difference. Help please.