Backup an restore the whole Server.
 

Unfortunately I had to reinstall a server with many users.
I had to restore each user individually with "user import", the user must be created before the import :(
it took many hours. how can I restore all users together after reinstall the OS. without so many work?

Hello,
Unfortunately, there is no another way. Probably, it will be useful if you write a shell script for automatically user creation and restore via API.

sorry, but i use ISP precisely in order to not have to write scripts. hope it will be improved in future Versions of ISPManager

You can use
http://bugtrack.ispsystem.com
to add your wish to our developers.