One thing which you can do apart from following BlogSpot guideline is taking a periodic backup of your BlogSpot blog. This will ensure that if something goes wrong with your blog in future, you can always restore your data and posts.
Blogger backup is a very handy tool for BlogSpot bloggers to take a complete backup of their blog.(The software is very simple and handy to use, just log-in with your user n pass and software automatically retrieve the list of blog and you can select the blog , from which you want to download the contains.There are several other options which you can use like you can download posts along with comments.
