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+id = 2919
+title = "qemu-ga update resetting VssOption Registry key to default"
+state = "opened"
+created_at = "2025-04-10T14:56:21.810Z"
+closed_at = "n/a"
+labels = ["Guest Agent", "guest: Windows"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2919"
+host-os = "Proxmox 8.3.5"
+host-arch = "x86"
+qemu-version = "n/a"
+guest-os = "Windows Server 2022, 2024/04 patch."
+guest-arch = "x86"
+description = """Before I installed the .exe from iso `virtio-win-0.1.271.iso`, I had value 5 in registry key `HKLM:\\SYSTEM\\CurrentControlSet\\Services\\QEMU Guest Agent VSS Provider\\VssOption`.
+After the driver update by the .exe, the value was set to 1.
+
+This registry key shouldn't change in driver update, as its value was manually set to 5 and it is important to preserve MSSQL backups in Proxmox.
+Source:
+https://blog.datact.ch/backup-mssql-server-with-proxmox
+https://forum.proxmox.com/threads/pbs-breaking-customer-sql-backups-backups-without-fs-freeze.111526/"""
+reproduce = """1. Set a value to `HKLM:\\SYSTEM\\CurrentControlSet\\Services\\QEMU Guest Agent VSS Provider\\VssOption` other than 1.
+2. Install the .exe from version 0.1.271.
+3. Check the key value."""
+additional = "n/a"