Just keep that HDD in good condition and you should be able to check the S.M.A.R.T. Status with programs like speedfan. Make sure it stays in good shape.
But.. There's lots of other ways you can do a backup.
You can keep files on another HDD in your computer. Just make sure S.M.A.R.T is enabled so you are aware of any chance of failure of the HDD.
Sometimes is what I do is burn them to DVD's and ask friends to keep hold of them. Or put them in a lockbox somewhere where I know there safe. A.K.A Off Site Backup.
There are also personal servers you can purchase that backup things in real time.
But I find that the external HDD is the easiest and best way of backup.
But.. There's lots of other ways you can do a backup.
You can keep files on another HDD in your computer. Just make sure S.M.A.R.T is enabled so you are aware of any chance of failure of the HDD.
Sometimes is what I do is burn them to DVD's and ask friends to keep hold of them. Or put them in a lockbox somewhere where I know there safe. A.K.A Off Site Backup.
There are also personal servers you can purchase that backup things in real time.
But I find that the external HDD is the easiest and best way of backup.