Subsonic Forum

I am running Subsonic on a PC.
When I open C:/Subsonic/db, I no longer see a subsonic.backup file.
Is that supposed to be created automatically? How often does it typically get backed up?

If I want to manually backup my database: Which other files do I need?

That is only created during upgrades.
If you want a simple backup try Veeam Endpoint Backup.
Free forever.
I use on on one of my windows instances of subsonic with great results.