Looking for a good backup storage

hi friends,

I am using 1 TB internal HDD on my PC. But sometimes some of my files get deleted (movies) etc and sometimes our OS gets corrup.

So what is the best way to backup my PC. Should I go for 1TB /2TB internal or an external HDD. Please give model number which is the better among all and why ?

I didn’t find the right solution from the Internet.

References

http://geek.digit.in/community/threads/looking-for-a-good-backup-storage.196267/

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