[MINOR] Use unique name for temporary backup file

MERGE REQUEST

MR Guidelines

Overview

This MR changes the backup code to use a unique name for the temporary backup location on disk and only deletes the temporary backup file instead of the whole temporary folder. That way we don't accidentally delete other backups which are currently in progress.

Checklist

Review and complete the checklist to ensure that the MR is complete before assigned to an approver.

• All new methods or updated methods have clear docstrings
• Testing added or updated for new methods
• Any new packages are added to Makefile and .gitlab-ci.yml
• API documentation updated for API updates
• Module README.md updated for changes to workflow
• Issue added to Sia-UI repo for new supporting features
• Changelog File Created