Improve performance and resilience with tar or rsync-style transfers

[mcandre]

Hi,

I noticed that skbn is a bit slow and fragile. The transfers can take hours to complete, and if they are interrupted, then the user is currently required to restart the whole process. Not fun!

Fortunately, this is something that rsync, or even tarballs can improve. Because these tools reduce transfer overhead.

I would like to see skbn behave more like that. Then I can have more confidence that everything is running smoothly in my Kubernetes cluster :)