My Server don't want to restart after upgrade

[macspyre]

Hi,

After a upgrade, my server crash (FC4 8.11).

Here is the succes mail just before the crash :

Download file versions.inf3: 24%..100% done
Download file PSA_8.1.0/plesk-8.1.0-fc4-i386.inf3: 100% done
Checking for system installed packages...done.
Check for components installation status
Reading system installed packages...done.
Download file build-8.1.0-fc4-i386.hdr.gz: 70%..100% done
Download file update-8.1.0-fc4-i386.hdr.gz: 23%..54%..85%..100% done
Resolve components
Get Plesk product packages.
Download file opt/updater/psa-autoinstaller-3.1.0-build31061201.02.i586.rpm: 22%..51%..81%..100% done
Get system update packages.
Start packages installation
Install package psa-autoinstaller
Installation done.

I can start my server with a netboot, for back up; but I would like to know how backup more than the /var/www/vhosts folder.

I have 30 domains on this server, with lots of emails, and mysql bases.

Do you think I can restore data on another server with Plesk ?

I'm not a technician, and my hosting company can't help me.

Please, help !