The automatic backup doesn't work in our CRS 5.0(2) system either. In our case we get neither any failure log nor a message that shows that the process starts. We get nothing. It seems to be ignoring the backup schedule.
The manual backup works. The file is saved in the remote folder. We haven't tried to restore it.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...