There are two types of disk snapshots in libvirt: internal and external. Internal snapshots (virsh default) store all data in one file. With external snapshots, base data and snapshot data is stored separately: base disk file is left intact, and all changes are written into a separate snapshot overlay file …

This might be useful to connect e.g. Windows XP to ZeroTier network or other machines which you can't or don't want to install ZeroTier client to.

1. Create ZeroTier network in control panel and join it on your host

2. Allow Ethernet bridging for your host in control panel

   

3. In VM …