UpdraftPlus 1.9.0 has been released for free users. See yesterday’s blog post for the full details.
The full changelog is here: https://updraftplus.com/changelog/
The update will start to become available for paid users in around 48 hours time.
We always recommend updating; but this release is especially important if you ever want to restore a backup on the forthcoming (i.e. not yet released) WordPress 3.9, which has a new internal database layer.
David Anderson (lead developer, founder, UpdraftPlus)