i want to make an app for crypting personal settings

Hello,
as u all know many programs save personal datas, like f.x. pidgin ur passwords in the file accounts.xml and gpg the key and so on. Espessially on the stick this really sucks when it goes lost.

My idea was to make a script / programm what is stored in the Portable Apps folder.
in a txt file u say what files or folders are personal.
then the script runs 7zip and encrypt these files / folders.
And delete/overwrite them.

Next start u just make decrypt here to the archive and it puts the personal files in the right places.

When plugging off, again u make an archive with the script

If someone would be interested in this i would start to make it.
I would make it in C++ for good overwriting the files to delete