You can also export your bookmarks from your browser. It will be a .html file. I back up my bookmarks every other month and I use the date I backed them up on as part of the file name, i.e. bookmarks 9-9-10.html and I store the document in a folder I named bookmarks. That system comes in handy if you ever delete bookmarks. You can refer back to an earlier time if you need to recover the deleted bookmark.
I agree with lab fairy that you should take your computer in. The technicians know of ways to recover your files.
I learned a long time ago to back everything up on disk. Granted, it may take several days to do this. I even back up my email messages. When I got the dreaded blue screen back in March,I wasn't upset because I hadn't lost a single file. Everything was already on disk.
You can back up your files on either CDs or with a pay to store site. I personally prefer CDs. I don't know who these 'pay to store' companies are or what they might do with my files and information. What if they go out of business? Most of those companies are not local. I try to back up my files every 3 months. To make things easier for yourself, you may want to keep a list of those files folders you did something in. That way when you go to back up the latest changes, you only have to back up those particular folders and not all the files on your computer. Then keep all your backup disks in 1 container, preferably away from home, like at work.