MonitorSpider Windows backup kit — https://monitorspider.com/backup-kits/

Easiest path (guided):
  1. Create a 'Backup (push)' monitor at https://monitorspider.com/dashboard/
     (the free plan includes one) and copy its ping URL.
  2. DOUBLE-CLICK START-HERE.cmd. Windows may warn about a downloaded file —
     click Open — and then ask for administrator rights — click Yes.
     Paste the ping URL and answer the questions. The wizard copies the
     kit to C:\server-backups\kit (you can delete this unzipped folder),
     detects your SQL instances, writes the config, installs the portable
     tools (SHA-256 verified), runs the pre-flight checks, registers the
     weekly scheduled task, and can run the first backup right away.

Manual path: fill in backup-config.json from the example, run preflight.ps1
(-Install for tools), then schedule windows-sqlserver.ps1 via Task Scheduler.

Guide: https://monitorspider.com/blog-sql-server-express-backup-script
MIT licensed. The scripts are plain text — read them before you run them.
