Yes, we don't like spammers. And of course you can share your backups. I love Dropbox! Bad thing about a new Jailbreak is a lot of apps and tweaks won't work until updated for that iOS.I know I'm quoting myself... another feature of this Dropbox saving method is that you can share your backups.
Okay. So it's a good idea to save it with iFile or DiskAid like I originally said. That's how I've always done it as well.
As long as you have it saved on your computer and then via iFile, you're good to go.