Recently I noticed that drive C: is decreasing in free space on my Azure VM running Windows Sql Server 2016 (doing daily azure VM backups in Recovery Services Vault). Drive C: keeps adding 100-250mb per day and I just cannot trace is what is causing this. Free space is decreasing while total size of all first level folders is not changing. All work and everything related is running on a different drive (I disabled everything possible on drive C).
What I tried so far: checked IIS logs (it's not it), checked treesize app (folder sizes are not changing), Windows Error Reporting disabled
Anyone have any idea what it can be? Thank you.