Iphone 4s over capacity problem?

I had a faulty iphone handset which I spoke to an apple worker about last night. He advised I back up my phone to my computer, then get a new handset, then i restore the backup to the new handset, so I have all the things I had on my old phone on my new one. I got my new handset today and I restored the backup I made last night to find that the category "Other" is taking up 8gb of memory, whereas before it took up about 0.9gb. I don't know how this has happened and I have no clue how to fix it. Can anyone help?

Other should be around 3.8-4.9 gb
other is the ios that runs the iphone

  • Why is my iphone over capacity? I only have like 9 apps and not even 100songs on it? I'm trying to add pictures to it but its saying its over capacity and its also going really slow, i've token out half of my apps and deleted most of my pictures too but nothing helps
  • Why is my iPhone copying the same video over and over? So I took a screen recording earlier today and when I went to send it, there were about 50 of the same video. I thought alright i'll just delete them. So I did. And they returned. I now have over 300 of the same video and it keeps copying itself.
  • Why does Netflix keep pausing and playing over and over? I'm using it on my iphone 4. And I have checked my connections over and over I've uninstalled reinstalled, signed in signed back and everything else that the troubleshoot website has recommend. And it's gotten annoying. It didn't start doing this as much until I updated the app before the ios 7 release. I'm currently using the trial for netflix and my laptop doesn't work so I can get it on anything but my phone.
  • Why Does My Itunes keep saying Over Capacity? I Have a16 Gb iphone and i currently have 1,140 songs which takes up 8 gb total according to itunes, keep in mind that i have over 1 gb free, so i decided to add a few more songs and tried to sync but then it said over capacity by 302 mb i don't get it, How can i be over the capacity by 300 mb if i have at least 1gb available?/ can someone please explain this!