Unison File Synchronizer

http://www.cis.upenn.edu/~bcpierce/unison/

Seagate 500GB Internal SATA Hard Drive 500GB at OfficeMax

http://www.officemax.com/omax/catalog/sku.jsp?skuId=21227254&cm_ven=Performics&cm_cat=Ben’s%20Bargain%20Center&cm_pla=Rubberband%20Logo%20120×60&cm_ite=Rubberband%20Logo%20120×60&affcode=performics&siteID=k9470&mid=

OfficeMax.com has the Seagate ST3500641AS 500GB 7200RPM 16MB Buffer SATA
Hard Drive for $120 – 20% code OFFICE [Exp 3/15] = $96 with free shipping.
Covered by Seagate’s signature 5-year warranty. 3D Defense System takes
preemptive measures to ensure drive integrity and data security.