New
#31
I amended my last post as I read your reference to making a Recov Disk wrong.
I also think 50gb might be sufficient for the OS partition if you're linking the User folders to another partition - but of course this depends on how many programs you have, and if you want to increase space (I use 20%) for System Restore points so you have more options if you need to rescue your System: System Protection - Change Disk Space Usage - Windows 7 Forums
However as the backup image only is as large as the used space, make OS/Programs larger if you want.
Remember you need to separately back up your User folders partition externally as well: Backup User and System Files - Windows 7 Forums. I just drag mine monthly to external.