Thanks for the info, but I rather have a physical backup. Is partition a feasible option for me?
First, I want to commend you for having the wisdom to have a backup of your data.
While there is nothing wrong with having backups in the cloud when using a good, paid cloud backup service (other than expense and long upload and download times), Google drive is not a good place for a backup. It's merely storage, which is not the same as a cloud backup service, such as Carbonite, Crashplan, or Backblaze. Free cloud storage is notorious for disappearing with little or no warning and is rarely secure from hacking. Google is notorious for discontinuing free services and is even more notorious for snooping. I trust Google Drive as far as I can spit upwind in a stiff breeze.
You are also wise to want a second backup. However, if you are talking about partitioning an internal drive to use for a backup, then the answer is no, it's not feasible (partitioning as you can suggest for convenience purposes can be done, although using folders instead of partitioning is more practical, but it would not be a true backup). If the drive inside the computer dies, then your backup partition will also die with it, leaving you with only the Seagate to recover from.
Any drive, including a backup drive, is subject to sudden, irrecoverable failure at any time without warning. Also, drive failure is not the only way one can lose data. User error (such as accidental deletion), malware, hacking, theft, fire, natural disaster, etc. can all cause data loss.
For data to be safe, it needs to exist in three, physically separate locations, such as on the computer, on an onsite backup, and on an offsite backup.
You are already halfway to having a solid backup plan. I recommend you get a second, external drive, replicate the backup on it, then store it offsite, such as in a locked drawer or locker at school or work, at a trusted relative's, neighbor's or friend's home, a storage facility, or in a safe deposit box at your bank (I use the latter). That way, if the worst should happen and you lose both your original data and the onsite backup, then you will have the offsite backup to fall back on.