yep, but i am just giving out several methods that can be used. Doesn\'t mean you have to use it.
So are burning it into a CD or copying it to a floppy disc which both does cost money too. But of of course, they cost no more than like 25 cents per disc or per floppy. But if one want to use the floppy disc method, imagine how many floppy discs will be stack up because of storage problem. and some data is too large to fit in a floppy disc.
I guess external hard disk drive is the most expensive method of the bunch for backing up data...
so, yeah, if you think about free, i guess your email method is definately 100% free.