Is there a way to...?

First off I apologize for a stupid question...
Is there a way to create a back up on a new iMac from my iPhone4 alone? It was previously backed up/synced to a pc which has recently died. I have a backup hard drive but I worry it is corrupted by whatever killed the pc
What are my options?
Thanks for any advice...

 

ok well if that is not possible, does anyone have any advice on how to get my old itunes backup files from a pc backup hard drive to an imac? Or alternatively, i may have an old backup file from pc. Will my mac recognize this file?