Master Data vs NSFileManager

Problem:

I have been using my own cache system with for some time now NSFileManager. Usually I get JSON data, and I just save the dictionary directly to the cache (in the Documents folder). When I need it, I'll just go. I also implement, sometimes when I feel better, NSDictionaryin the root folder with the keys / values ​​for the path for this resource. For instance:

The weather resource is in Geneva on 02/17/2013, so I will have a key called GE_17_02_2013 and the value is the path to NSDictionarythe information.

Usually I do not need to perform complex queries. But somehow, and from what I read when you have a lot of data, you should stick to Core Data. In my case, I usually have a lot of data, but I never felt that the application was going down or suffering in terms of performance. So my questions are:

• In this case, when sometimes (the weather was just an example) I just need to delete all the data (Twitter channel, for example) and replace it with a completely new data stream, is Core Data worth it? I think that deleting all the data and inserting (filling) it is harder than just saving NSDictionaryand replacing the old one.

• Sometimes it will include images, text files, etc. and    NSFileManagerdoes it perfectly, so what benefits can Core Data have in these cases?

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