What happens when you restore an iphone without a backup?

My iTunes is making me restore my phone because it gets all messed up when it gets overcapacity, but it hasn't been letting me back it up to the computer since march. I'm worried if I restore it now I will lose everything, unless I back it up to the last backup in march, which still means I will lose the last 2 months of data I have saved. What will happen if I restore my phone without restoring a backup afterwards, can I still sync my information back to my phone, or will it delete it all and I will have to restart?

It goes back to the way it came from the factory. U lose all data.

Don't try to sync your iPod. See if you can hook it up to your computer as data storage device and drag off the files you want.