Take Backup
If you have never backed up your data, stop everything and do it now! External hard disks and NAS drives are cheap and easy to use.Try to automate your backup process or make it as easy as possible. There are several free Windows applications that could help, including SyncBack Freeware, CloneZilla, Allway Sync, ezback-it-up, or FullSync.
Spare PC for emergency use
A spare PC is vital. It may be old or underpowered, but it will keep you working whilst you hunt for a replacement. I survived on a lumbering 8 year-old PC and a netbook – it was not always an enjoyable experience, but it allowed me to keep in contact with clients.
External HDD
Even if your PC is irreparable, the hard disk may be intact. It is relatively simple to remove the device, slot it into an enclosure, and create a USB hard drive. This allows you to retrieve data that had not been backed up, but do not rely on this as your only backup method.
Online synchronization
Online storage is unlikely to be practical for all your data, but it could certainly be used for vital files such as password databases, important accounts, or current documents. I can personally recommend Dropbox; it is available on Windows, Mac and Linux and just works.
Automatically forward your emails
Emails can be instantly forwarded to a GMail or any other webmail account. This allows you to check messages from anywhere and provides a historical record of messages you may have lost otherwise.
Move your work into the cloud
Although there have been a number of high-profile failures, cloud computing is here to stay and most applications will be more resilient than your own PC. Online applications such as Google Docs, Zoho Office, Buzzword, and ThinkFree offer viable alternatives to desktop suites.