Upgrade from 3.7.1 to 3.8.0 ?

[Suri.CMS]

Hi All,

I currently run my board on vBulletin 3.7.1 Patch Level 2 and want to upgrade to 3.8.0

Questions:

1) Can I directly take the files of 3.8.0 and upgrade from 3.7.1 ?
Or Do I need to do any intermediate upgrades ? (Lets say 3.7.1 to 3.7.5) ?

2) I have made few custom changes. I can REDO the changes after upgrade is done. But in order to do that, I need the template files of 3.7.1, so that I can view the files and perform the same changes to the files of 3.8.0

So how to take backup of template files before upgrade ?

3) I have 2 styles :

Style # 1 (Default one)
Style # 2 (Duplicated from the default style and then few custom changes done)

Now, if I upgrade from 3.7.1 to 3.8.0, will the new template files of 3.8.0 replace both the Style # 1 & Style # 2 ? Or do they replace only the Style # 1 ?