My advice would be to purchase a small NAS (Network Attached Storage) unit. They connect into the office network and allow you to do exactly what you want, at a very reasonable price. For example, a Buffalo Tech TeraStation NAS with 8TB of data is less than $900 USD on buy.com (free shipping). They have many other options, with less storage (cheaper). I paid more than this, each, for two of their 1TB units about 6-8 years ago, and they are still functioning without problems on my network. One I upgraded to a 2TB capacity this year, and that holds system backups, Linux distributions, and copies of my purchased software. The other I use to store my music files. They are both configured as RAID-5 devices, and work really well in surviving disc failure (the excuse I used to upgrade the one unit - one drive started to fail - no data was lost).