Recent record rain in Mumbai took its toll on IT too. Many call center located in Mumbai diverted work/call to Delhi and Bangalore. This put lots of pressure workload in this cities.
Network administrator had their worst nightmare. Many of cities ATM, phone lines, Mobile networks were down. Although connections resumes now.
My friend needed some money here in Delhi so he went to SBI as well as HDFC ATM and guess what both were down due to rain in Mumbai. Most of the banks in India have data center in Mumbai and rain hits it very badly. In these days of cutting edge computers, Internet, and satellites banking operations should be easy. I don't believe then don't have backup servers and routing in first place :( . We claim to be number of hot spot for outsourcing jobs, but we don't know how to handle such disaster.
These days lots of private data center exists in Delhi, pune, bangalore cities. Why banks in Mumbai partner with them for backup servers and routing i.e. outsource your work to other cities in India itself so rest of the people get service.
Because they have don't have backup plan in Mumbai the entire banking network went on blink (network is unreachable!!!). This is not good for for developing economic.
Nearly 800+ people are feared to have been killed in worst-ever floods and loss of billions of dollars. May they rest in peace.
Wikipedia has article on Maharashtra floods of 2005.