Oracle Virtualbox snapshots status
Solution 1:
If I understand things correctly, then:
- green with play triangle
means snapshot taken for running machine (called "online"); - red with stop square
means snapshot taken for stopped machine (called "offline").
I usually take snapshots of stopped machines to avoid possible problems.
For details see: http://download.virtualbox.org/virtualbox/6.1.16/UserManual.pdf (ch. 1.10, 5.4, 8.6).