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It all depends on how valuable your data is to you and how much you want to invest. Of course it is impossible to secure your data completely but you can get really close. Options: Second HDD: Just putting the files you want to be secure on a second drive: This works as long as you have the discipline to do this every time you change something. RAID: By setting up an raid (either hardware or software) you don't have to worry about copying the files you want to be save to the other drive. You could just set the whole thing up, that the second drive is an exact copy of the first drive. External Backup Solution: NAS or even a dedicated backup server in your home network: This is more expensive and more complicated to setup but is way better in terms of security of your data. Having a backup solution that is physically separated from your main system also has some advantages: If your main machines power supply fails it could possibly kill every attached hard drive. So if you have another machine for your backups this can't happen. Off site backups: This protects you from even the greatest disasters. Because even the most redundant setup has no use if it burns down with your house or if it get's fried with all the other appliances in your house by a lightning strike. The only problem is, that this solution normally requires you to rent some kind of server or cloud space where you have to transmit your files to. For this you need to have (depending on the size of your files) a fast internet connection. These are only the most common solutions, there are a lot of other options. You could also combine these solutions. Here is how i keep my files backed up (This option is only for you if you like to fiddle around a lot): I have a backup server with four 2TB HDD's in RAID 1. This results in me having 4TB of redundant space. The server runs scripts on my computer to backup all the data on it's drives every day and create daily snapshots using ZFS so I can revert all the files to any point i ever created a backup. So all in all I have three copies of my files (One on my computer, and one on each HDD of the backup server). To lose all my files three drives have to fail which is not very likely to happen. In spite of all this the system isn't perfect as it is all in one house. You could possibly upgrade it by weekly (or even daily depending on your needs) backing your backup server up to a external server located at best a few kilometers away from the original backup server.

I haven't tried it yet but maybe Ipadian suits your needs. You should consider buying the full version for 10$ because it features access to the real Apple app store while the free version is limited to a selection of apps (if i got this right from their website).

Wait, are you talking abouth something to emulate iOS on let's say a computer? Or are you want to emulate a game on your iOS device? If the first thing is the case the only thing i know abouth is the iOS emulation thingy going on in Apple Xcode on a Mac OS you can use to test your apps in.