As far as I know the IP's aren't linked to your hard drive
As for getting backups...if a drive fails then you had to have them on like a NAS or eVault or on your computer. The rest I don't know the answers to, I've yet to ever have a hard drive crash.
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Its always a good option to do a weekly full system state backup from OS. This includes all configuration files and data.
As a part of Disastar Recovery, first build OS and then do a full system restore. It should bring back the cpanel and files.