Save program from iPad to Mac I bought some program for iPad and this program became crucial for my work - if the iPad will corrupt/+developer delete the program from AppStore I will be in great trouble. 

So, my question is how can I save the program from iPad to MBP (from MBP to external HDD) to prevent any future corruptions of the program/store etc. Could I reinstall the program back to any new iPad from HDD only (if it will be unaccessible from Appstore).
You can log into your iTunes Store account in iTunes on the Mac and download the app there. As long as you have a copy on your Mac you can always sync it to your iPad if required.

The .ipa file (the app) is stored in /Users/&lt;youruser&gt;/Music/iTunes/iTunes Media/Mobile Applications, the name may need some guessing. You can also right-click on the app icon directly in the App view in iTunes and select "Show in Finder"