Using VS.NET 2003, VB.Net, MSDE...

I have had a .NET .VB file get trashed for no reason (maybe hard disk
problem), so in addition to normal back ups, I want to automatically copy
these .vb code files to a back up location each time I use .Net.  A batch
file seems the best way to do this (any other ideas?).

Question 1) Is there a way to execute a simple DOS batch file when VS.NET is
started or quit (or when a specific solution is opened/closed) ?  I believe
the answer is no.

Question 2) Is there any reason that you cannot start vs.net from a batch
file by simply copying its shortcut Target from it properties to the batch
file?  This is a line like:
"C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\IDE\devenv.exe"
This seems to work OK, but leaves the DOS/Command window open.

Question 3) If I have a project named Solution, and back up via xcopy in a
batch file C:\Solution and all its sub directories, if some or all files are
trashed, is the back up enough to recover the solution?  I believe the
answer is yes, but am concerned their might be some file(s) kept elsewhere
that are needed.

Thanks!
Bob Day