what is it you are asking for your post description is not good enough.
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hostgator : not more than 25% of system resources for longer then 90 seconds.
rochen : more than 5Mb of memory space, more than 15 CPU seconds, or use more than 5% of all available system resources at any time.
site5 : vague - an unacceptable amount of system resources
While this may have no meaning or not, as the host only determines surplus resource usage on parameters unseen to the client, it is good to know these facts just side by side XXX GB and YYY transfer.
Not asking to enumerate all the points on the first page, but just that : how much system usage.
It may be good to choose from similar uptime, reputation, storage and transfer the one offering MORE sys resources, at least in theory.
Also my another query is what is a practical example where one can use 15 GB space and 1 TB transfer ( eg site5 latest plan or for that matter 2 GB space and 60 GB transfer ) without causing sys resource over-usage, does such example exist ?? Will be good to know from each webhost what example they think.
Static resources :
rochen : All of your data is backed up once per week to an off-site remote location using the latest Network Attached Storage (NAS) technology
hostgator : You agree to take full responsibility for files and data transferred and to maintain all appropriate backup of files and data stored
While backup is always clients responsibilty it seems its good to know what measures each host apply for backup.