Blogger has introduced Undelete this blog for you to easily recover deleted blogs. Unfortunately there isn't a "Undelete post" yet. So if you accidentally deleted a post, how can you try to recover (undelete) the deleted post? There are a few ways, some which which depends on good memory or clever guesswork.
Method 1: Using Blogger feedGo to Feedly.com and type in the post address (url) into the search box and if you can find the feed, you can copy-paste into Blogger. For full recovery, your feed should be set to full, otherwise you will just get a partial recovery.
Method 2This method is applicable if you are still working on the same computer where you had prepared the post (or had viewed the deleted post). Just press ctrl+H to open a sidebar listing the browser history. Go to the part where you were editing the post copy-paste from the cached copy of the displayed post into a new post or continue to edit or publish the post:
Alternative keyboard shortcut to call up the browser is shift+ctrl+H (shift+Cmd+H for MAC OS).
Method 3This method is applicable if you have not closed the tab or window where you had been preparing the deleted post (or had viewed the deleted post). Just keep pressing the BACK button till you get back to the point where you were editing the post (or had viewed the post).
Method 4Try to find a cached copy of the deleted post on the Web and restore the post from the cached copy. Type into Google search box
cache:address (URL) of the deleted post or some keywords from the deleted post to try to find cached copies on the net.
If the search throws up a result, click the link cached (see screen shot below) to open the cached webpage and either reconstruct a fresh post with the content from that cached webpage.
Another possibility is to try the Way Back Machine. For demonstration, I typed in the old pre-custom domain URL of this blog, namely http://blogger-tricks.blogspot.com into the Way Back Machine and this is what I obtained: archives of blogger-tricks.blogspot.com from Way Back Machine and below are the screen shots of the results:
and here is the screen shot of the October 8 2007 archive which showed no background color for the header and the old Google AdSense custom search box which if you compare with the current search box above, is different thus verifying that is is the actual archive of a page which now is non-existent on the Internet:
Once you have located a cached copy from the search engine, you can either copy the content and create a new post using the pasted content. However, the permalink (individual post URL) will be different from the original. If you don't want to recreate the post but want back the same permalink, then refer to Method 5: recover deleted post with original permalink.
Method 5This is applicable even if you have no access to the computer where you had edited or viewed the deleted post, but you must have the URL (permalink) of the deleted post. If you don't have the URL, then you can try to guess the URL from the post title.
You will also need to know when the post was first published, or alternatively, can guess the date. This is because Blogger incorporates the date (year and month) when the post was first published.
Note also the URL ends with .html
For example, the title of this post is "Recover accidentally deleted post: How?". Now I haven't published the post yet, but I can guess that this post URL will be:
If you have or can guess the deleted post URL and you want to try to undelete the deleted post, you can try posting the post URL and your problem at Blogger Help Forum and hope to catch the attention of a Blogger Employee.
Refer to Recover accidentally deleted post with permalink intact for Method 5
Recover deleted blog (undelete blog)
How to recover accidentally deleted blog
How to recover deleted gmail or Google account.
Recover deleted post with original permalink and comments