Google analytics, multiple sites accounts or properties?

I have one google account (ie one google login) but within my google analytics I have set up a different account for each website.
So I have 9 accounts, each one with a single property (ie a single website).

As it is the property not the account that defines the web address, UA code and link to webmaster, I guess I should have used one account with a different property for each website? Then I could have shared filters etc??

Is it too late to move them? - I can’t see any way of doing it, and i’m scared of messing up my data !

No, I don’t think it’s too late. I’m pretty sure Google keeps backups of your accounts, you can just contact the support or try moving it yourself.