Before iCloud I had my iPhone and iPad backups saved on my iMac's harddrive in iTunes, together with all Apps I've downloaded and so forth. But with iCloud the backups are in the cloud and not needed to take up space on the hard drive. I recently checked the map for the apps and it was over 35 GB. Now with the iMac and its 1TB hard drive this was never an issue, but now I'm thinking about selling it and just keep everything on my Air with 128 GB of space it certainly will be. But since my Apple Id is linked with the App store, so I can re-download apps I've bought and deleted, do I actually need to have them saved on my hard drive or could I just delete that huge map? What purpose does that map have now with Apple knowing which apps I bought and me being able to re-download them?