International Journal of Research and Computational Technology (IJRCT)
The earliest approach to data reduction was data compression, which searches for repetitive strings of information within a single file. The other approach was single instance storage, which reduces the amount of storage by recognizing when files are repeated. Data de-duplication is the newest technique for reducing data. It recognizes differences at variable-length block basis within files and between files. Data de-duplication systems store data differently from how it was written. As a result, users are concerned with the integrity of their data.