What is Google Documents?

I use Google Docs (short fot Google Documents) almost everyday. This is where I keep all of my work documents. This way, I can work on them while at work, and I can resume working on them when I get home (only for emergency of course). Some of these files are published to the blog here. Just to be safe, I export any really important files on GD onto my USB thumbdrive. This way, if I have no access to the Internet, I can still have access to these documents. Google backs up these files for me, but if for some reasons, the files are lost on the Google server, no matter how much I complain to Google, the files still are lost. When it comes to backing up my data, I always do it manually onto my own drives even if the data is supposedly backed up by someone else.