I use the backup feature in Norton Utilities, which is provided by my ISP, utilizing those USB thumb drives as the backup medium. When my laptop went Tango Uniform a few months ago, however, I found out that the backup program had generated one large file that I couldn't get into to find my crucial aeromodeling files, among others. I had to remove the hard drive and install it in an external hard drive case (not difficult or expensive to do) in order to access the files. I'm not sure if this is the way other backups mentioned here work. With my new laptop, I still use the Norton backup, since it would still be useful to restore the hard drive if necessary, but I also copy certain folders to a USB drive separately. Folders labeled Aeromodeling, Docs, Pictures, Cars, among others, are copied as they are, so I can access them easily if necessary.
I've used name-brand USB "Thumb" drives for years and never had a failure of the media (yet). This week's circulars for the Staples and OfficeMax/Office Depot in our area show a 16Gb Sandisk for just $6.99 and a 32 gigger for $12.99 at the former and Lexar drives of the same capacity for $7.99 and $19.99 at the latter. Those are very good prices; you should grab one or two and try them if you don't have any.
Respectfully,
Bob in NEPA