TLDR:

Pros: is a DE

Cons: is a DE

VirtualBox also has snapshots, which is useful when the VM is used to “play around the OS” and possibly break the OS, such as sandboxing a custom OS build, checking out a malware, etc

In the case of house burn down, because Syncthing stores a 1-1 copy of the folder on every device in the network, you would still have your data even a single device survives the incident, such as a phone, or a laptop