Migrate Guru: Migrate & Clone WordPress Free
This plugin allow you to transfer your wordpress web site to another hosting for free. It support sites upto 200 GB in size. Use BlogVault to do the transfer.
All-in-One WP Migration
This free plugin allow you to backup and restore your wordpress site. Free version support sites upto 500 MB. If your site is larger, you need to use paid version of this plugin.