There is a cydia application that I use that is no longer available to download. I'd like the keep the application before updating to ios7 and jailbreaking. Is there a way to save it somewhere and reinstall it on my end after ios 7 jailbreak?
Depending on the host of the package, you may be able to find it online or it may be available in a different legitimate repository. The package will more than likely not work on iOS 7, so even if you have access to the deb, you won't be able to get it running unless the developer updates.