I'm running into a similiar issue, however, my line is slightly different,
kron policy-list BackupCfg
cli show run | redirect ftp://xxx:xxx@xxx.xxx.xxx.xxx/XXXXXX.cfg
And the backup file only contains
Building configuration...
Current configuration : 34430 bytes
It happens to
1. WS-C3650-48PD 16.3.8 CAT3K_CAA-UNIVERSALK9
2. WS-C6504-E s2t54 Software (s2t54-IPSERVICESK9-M), Version 15.1(1)SY1
3. C6807-XL s2t54 Software (s2t54-IPBASEK9-M), Version 15.1(2)SY1
