If I ever change over to Google +, I'll put up a tutorial here only if it is significantly different:)
Sorry for the delay in this final part of safely downloading and storing all your blog. This is the final part!
First of all, log into your blog and if you don't open up in it, go to your dashboard. At the top right, you will see your user name and a little downward facing arrow, click the arrow and select account settings:
Now click select data to download:
Click on the blue box that says, Create an archive:
Once you have a tick, go back up to the red box that says Create Archive and click on it.
This top part of the screen that appears, looks like this. Within a few seconds, it will begin downloading your Picasa Web Albums.
It takes a while so go and have a nice cup of tea or coffee and keep checking back.
Once it has finished, it will put up this screen:
By now you should be getting the hang of this. Go and find it. If you can't remember where your computer puts downloads, just search for .zip and it should show you where it is. Mine looks like this:
I hope I haven't missed out any important steps, if so, please let me know.