I just added my whm/cpanel server to backup pool.
I got the following error when trying to back up:
Fatal error (bad version): stdin: is not a tty
Done: 0 files, 0 bytes
Got fatal error during xfer (fileListReceive failed)
Backup aborted by user signal
I found that I had “mesg y” on /etc/bashrc
As soon as I commented it, the backups start working.