Hello,
I recently replied in another thread, maybe you should check other threads before creating a new one 
Anyway, for backing up VMs:
For VMs, Veeam or Altaro are great solutions. I think Veeam has no limits when choosing VMs to back up however with Altaro is limited to 2 VMs per host or something like that.
To save your ESXi configuration, you can do it by command line on the ESXi, more information: https://kb.vmware.com/s/article/2042141