Which snapshotting method did you choose when re/installing the client?
Was there any reason you didn’t choose to use/download the client using the “Download client for Linux” pull down on the urbackup web interface “status” menu?
I ask the latter because I have found that otherwise - I have to do more “re-setting” up of the linux client. (May just be my own incompetence though 
)
Backing up of EFI has/is potentially problematical. See this and subsequent reply by Uroni.