ftp - Building embedded system with no reliable internet connection -

I'm not sure how to find it on the Internet, I tried some searches but never got help , So I'll just ask here. (If it has already been answered then sry!)

I am creating an embedded system that runs on windows. I will collect some data and send it to the Internet for reading at home. I am most likely to connect my system (which keeps moving) using 3G connection from the internet and sends data. I plan to use an FTP server with a Hamachi connection to send the files to another PC and it will be automated, so only one person's action will be to read the data at home. I tested and it all works fine when I use a reliable connection, such as when I go home.

My question is, will this work when my 3G connection drops and how can I make this system reliable? If the data is down and I send it back online, then I want to submit the data, but I do not know the system will automatically connect (I can not 'connect' to manually connect 'person' ) Or in Hamachi

Also, is there a better, more reliable or simpler way to send data than Hamachi + FTP?

Thx,

Edit: Adding More Information I am collecting data with LabVi VI to save this data in a file (TSTT, CSV or whatever) , To send the file up and to read the file is another six and some graphs and etc. have been displayed. Labwave has a datasocket for sending some data to the internet, but I am not familiar with these Internet protocols, it says that I can use FTP, HTTP and others. What is paid and what can I do for free?

Also, more reliable or simpler way than sending Hamachi + FTP to data?

E-mail (SMTP) can be easy to use? The advantage of this is that the sender and receiver are not required to be at the same time.