Why did my iPhone recover pictures by itself?

A while ago my iPhone recovered around 900 pictures and videos that I've deleted long ago by itself and I'm afraid it'll do that again. Does anyone know why it recovered those pics and videos by itself?

Automatic backup

One little known fact if you restore an iPhone from backup it will actually un-delete any recent pictures or video that have yet to be overwritten by new pictures even if the backup took place after the respective photos were deleted. The longer you go without doing a restore the more likely those photos are in fact gone forever. Regardless if you have not restored your phone then you probably have the pictures stored in a photo stream or an iCloud Library somewhere.

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