ESXi host configuration backup and restore

Backup of ESXi configuration

To take backup of ESXi configuration use following steps:

Save/Sync latest ESXi configuration to bootbank:
```
vim-cmd hostsvc/firmware/sync_config
```
ESXi configuration is saved every hour automatically to the /bootblank/state.tgz file. For this reason, you should ensure that the current ESXi configuration is written to ESXi configuration files right now to confirm that all changes made to ESXi configuration since the last autosave are saved:
Take/Download backup of saved configuration using:
```
vim-cmd hostsvc/firmware/backup_config
```
The above command will output temporary URL (Shortlived - Valid for a few minutes). Use that URL by replacing asterisk (*) with IP/FQDN of ESXi host to download the configuration.
The file gets created in subtree of downloads folder of Scratch partition (Refer ESXi persistent scratch location esp. for VSAN nodes)

If you have backup of ESXi configuration taken using steps mentioned above, then the same can be restored using:

Enable maintenance mode on host using:

esxcli system maintenanceMode set –enable yes

OR other option is to use

vim-cmd hostsvc/maintenance_mode_enter

Ensure that file is named 'configBundle.tgz'.

mv /tmp/configBundle-esxi6-7b.localdomain.tgz /tmp/configBundle.tgz

Restore the configuration using:

vim-cmd hostsvc/firmware/restore_config /tmp/configBundle.tgz

Disable maintenance mode using:

esxcli system maintenanceMode set –enable no

Or other option is to use

vim-cmd hostsvc/maintenance_mode_exit

Refer: