Earlier quoted context omitted.
Whatever data I have backed up in the cloud is synced across multiple devices that I use. Even if the cloud disappeared altogether, I still have it. The cloud allows me to keep an up to date copy across various devices.
What's annoying is that synchronisation does't work for google slides or google docs. They are just synchronized as links to the webpage on my computer.
If you use Insync you have the option of converting to DOCX or ODT.
Insync has other issues though, my "sourcetreeconfig" is being downloaded as "sourcetreeconfig.xml".