I'm a little confused - iPhone camera roll and the iCloud?

Okay - bear with me on this guys:

So I'm trying to get a grasp on how my photos on my iPhone 4S camera roll are backed up to the iCloud.

I've hit my 5GB of free iCloud storage, I hit the limit about 3 months ago and I get a notice about every day that my iPhone has not been backed up in x weeks. Does this mean that if my iPhone were to explode today I would lose all of the photos I've taken since the last back-up date (not counting the last 30 days thanks to Photo Stream)?

I believe I was thinking about "back ups" incorrectly. Each time my phone backs up, it doesn't add anything to a previous back up (i.e. It backs up on Jan 1, and on the 2nd I take 10 pictures. It doesn't just add the 10 pictures to the Jan 1 back up), it completely wipes out the previous back up and creates a new back up, correct? Incorrect?

So my next curiosity is when I manage my Usage in Settings on my iPhone it says my Photos & Camera take up 3.8 GB. In my iCloud Manage Storage on my phone it says Camera Roll is 4.8GB and that I need an additional 6.6GB to back up the phone, so was my above assumption on back ups not correct? (ahh)

So I went to my iCloud on my desktop thinking I could find my backed up photos there and delete some to clear space on my cloud (naive of me?) but they aren't there and apparently there's no way to access them on your iCloud?

Basically, we put my childhood dog to sleep yesterday and I want to do everything I can to make sure I don't lose all of my pictures of him and I'm going nuts trying to figure this out. I realize this is more of a long stumbling rant than a direct question but any general guideline for dummies on the iCloud and photos would be appreciated. I need to make sure I don't lose these pictures and I'm about to just buy more iCloud storage, I don't even trust my computer or external HD…

Should I get samsung galaxy s4, iphone 5 or htc one?

I want to buy a phone but I don't know which one i should get. I really like the iphone 5 but I also have some taste for the samsung galaxy s4. Should I wait for the iphone 5s/iphone 6? I like the camera on htc one it's really bright but I don't know what else it does. Can you give me some advantages and some disadvantages on all the phone and tell me which one i should get.

Why are people so greedy and mean?

Seriously I've only met a few kind hearted people in my whole life! And by a few I mean like 5! Everyone else seems to only care about them self! To make it even worse this one time I found an iPhone and returned it to its owner! (I knew who it was because they texted the phone saying to call them and return it!) But yet when people found out I did that they were like "what?! Why didn't you keep it? You're stupid!" Only one person said that he respected me for doing that out if like 15 people! Like why can't people be kinder and donate some time or money to a good cause. Or return something that they know who it belongs to! I had my iPhone stolen once a long time ago and never got it back! But yet when I found that iPhone I was talking about earlier after my iPhone was stolen I still returned it! Also why do people give you mean looks sometimes when you just give them a simple smile or a hello? I mean c'mon people!

Apple iphone 4 won't turn on?

It has just been on the black background with the apple logo? Its fully charged. I can't plug it into itunes because its got a password on so it says it can't open up my phone in itunes until the phone is unlocked, but i can't unlock it because i can't properly get onto my phone! Please can you help! Also don't say to send it off to apple because i can't do that, surely there's other ways? Thank you, answer that makes my phone work properly again will get the best answer!

Iphone 3G shows only itunes symbol and usb connection?

Yesterday i was trying to update my iphone 3G from 3.1.1 to 4.2.1 but after completing "Restoring Firmware" process it turns off automatically and then it only shows a usb cable connection showing to the itunes. I tried to search lot of things on internet but it can't resolve my problem. I already tried Redsn0w, tiny umbrella, custom ipsw but it still shows that error. If anyone here faced this problem than please please please reply me with a proper solution.

Is my iphone safe with a hole in its battery?

I'm not going to lie, i was bored so i decided to open up my iphone 4s, i was looking at a tutorial on youtube on how to disassemble it and when he pulled his battery out, it came out with ease, because the glue was loose because he had done it before… Mine wasn't, so i unscrewed all the necessary bits, unplugged the battery and as i tried to pry it out with a SCREWDRIVER it ripped through the battery and there was a spark/flame thing and smoke (it stank!) so in panic i screwed everything back together and plugged it in to boot it up, it didn't lose any charge and it takes charge and runs without being plugged in and everything works fine.

all i want to know is, is it safe like this, should i take it to apple? Buy a new battery? Will it blow up in my pocket or something?

a speedy response would be much appreciated!