backup of app database

i need to place a bac开发者_运维技巧kup database in my iphone. so i want any place outside my app folder where i can place the backup database so that if due to any problem my app crashes the user has a copy of his data.

any other idea except of placing data on a remote server is acceptable.

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Why does it need to be outside your app folder, you could just copy and rename your database file and keep it in your app folder. I'm not sure it's possible to write outside your app folder.