Hi,
First, an intro would be a good idea, the Backup and Recovery tool requires:
1. to have deployed your SAS Deployment Agent in all your SAS hosts/nodes, since the Agents are responsible to "execute remote code"
2. To have started and fully working your Middle tier since it is a web application
3. All the machines should be able to see each other, specially from and to your Central Backup Vault
4. The configuration files should have the correct values (and no typos or incorrect/invisible characters, most of them created by copy and paste)
Keeping this in mind, I would advise to:
- check if all steps described above are OK
- run your backup
- locate and read your logs
If with this you cannot find your answer, SAS Technical Support can help to pin-point you intro the right path to follow.