JetBackup 4 uses a query to obtain the total size for all PSQL databases on a cPanel account using the `postgres` user to perform the query. This step can fail if JetBackup isn't able to authenticate with `psql`.
Please note that JetBackup only supports `md5` password authentication for the `postgres` user, and this error can occur if "peer" authentication is the default on your server.
```
[root@server ~]# psql -U postgres
psql: error: FATAL: Peer authentication failed for user "postgres"
```
Verify that Postgres is properly configured for `md5` password authentication (for the `postgres` user).
