Depending on where you bought the laptop with Win7 pre-installed, it may already have a backup partition (hidden) already installed - probably best to ask the Vender.
I would advise getting an external hard drive on which to keep Full Backups created by using Acronis True Image. I would not make Incremental backups, only Full Backups, at least fortnightly, or weekly if you make lots of changes.
I personally do not believe in making multiple partitions and have never done so - just making more potential for possible problems IMHO.
Make sure you have one good Anti-virus and at least one Anti-Malware program - I recommend MSE (Microsoft Security Essentials (free) and MalwareBytes Anti-Malware also free, though the paid for version is better.