I want my project to be backed up to two servers thru AnkhSVN.
I want that when I click "Commit" it should update two sources at once, is this possible?
You can't do this with AnkhSVN, or any other client, because the working copy can be linked to just 1 repository at a time. You can however replicate a repository to another location, giving you the copy of everything. Have a look at svnsync and Repository Replication in the svnbook.