AWS workspaces: Warning: Data loss risk when stopping nested virtualization WorkSpaces

Service: workspaces · 2026-08-19 · Documentation medium

File: workspaces/latest/adminguide/running-mode.md

Summary

Added critical note about hibernation unsupported on nested virtualization WorkSpaces, risking data loss.

Security assessment

Highlights data integrity risk (unsaved data loss) when stopping WorkSpaces, recommending AlwaysOn mode as mitigation.

Evidence

WorkSpaces running Windows Server 2025, Windows 11 24H2, or Windows 11 25H2 with nested virtualization enabled do not support hibernation. When these WorkSpaces are stopped, unsaved data will be lost.

Diff

diff --git a/workspaces/latest/adminguide/running-mode.md b/workspaces/latest/adminguide/running-mode.md
index fe38a9c68..0ea118b1e 100644
--- a//workspaces/latest/adminguide/running-mode.md
+++ b//workspaces/latest/adminguide/running-mode.md
@@ -31,0 +32,4 @@ AutoStop GPU-enabled WorkSpaces and GeneralPurpose.4xlarge or GeneralPurpose.8xl
+###### Important
+
+WorkSpaces running Windows Server 2025, Windows 11 24H2, or Windows 11 25H2 with nested virtualization enabled do not support hibernation. When these WorkSpaces are stopped, unsaved data will be lost. We recommend using AlwaysOn running mode for these WorkSpaces to avoid data loss. For more information, see [Nested virtualization for WorkSpaces Personal](./nested-virtualization.html).
+