About the MobileSync\Backup files

I'm using Windows 7 and it seems iPhone user files are backed up by iTunes at:
C:\Users\USERNAME\AppData\Roaming\Apple Computer\MobileSync\Backup
Contained here are folders with names such as
42404307097bdca8e85064f74468c213ac0eee20
42404307097bdca8e85064f74468c213ac0eee20-20100109-234124
42404307097bdca8e85064f74468c213ac0eee20-20100110-004834
Each of these folders is about 1GB in size, containing files with extensions .mdinfo, .mddata and a few .plist.
My questions are:
1) What do these files store? Obviously they don't contain the music on the iPhone.
2) Why are there multiple folders?
3) Can each folder be simply copied to another location and later moved back (eg after a Windows reinstallation) without breaking its functionality?
Thanks!

Hi;
When we are talking about "tape" when performing backup , does it really mean the magnetic band like with which we record musics ? If it is so , how to plug the tape into the computer , and does it need drivers ? Please see below link
http://en.wikipedia.org/wiki/Tape_drive
You can see what tape_drive looks like and how we use it for our backup
Also see:
http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci552729,00.html
Regard
Helios

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