You probably know by now that I am a big proponent of backing up your computer, to at least another portable hard drive and preferably another backup that is offsite, to protect you from fire and theft.
The reason I am a big proponent of backing up your computer is that all computer hard drives fail at some time - many times with no warning. With no backup, everything stored on your computer is gone - your pictures, music, documents - everything.
I have formed some opinions of what portable hard drive brands to buy for backups but it was not until I found this study that I solidified my opinion. My conclusion of this study is to never buy a Seagate drive.
Read thes quick studies - fascinating!
Hard drive brand study: http://blog.backblaze.com/2014/01/21/what-hard-drive-should-i-buy/
How long do hard drives last: http://blog.backblaze.com/2013/11/12/how-long-do-disk-drives-last/
How long do hard drives last for? https://www.comparitech.com/blog/cloud-online-backup/how-long-do-hard-drives-last