Is it possible to backup each blog separately from a multisite installation?
Can I do it with: http://wordpress.org/extend/plugins/backwpup/ ?
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That's a difficult one...
After learning Multisite, I've mainly used BB, a premium one and pretty good. It cannot handle this, only exporting a subsite into a single site.
When I used it, Backup to Dropbox didn't had any Multisite capabilities. And, if activated in subsites, exposed all the blogs.dir folder.
I'm not certain about XCloner, as I stopped using it long ago. But it is certainly a good plugin.
I've been thinking about this as a feature to add to DBC Backup 2 (my plugin). Currently the plugin will backup the WordPress database for your entire multisite.
The problem I found with wanting to backup a subsite is that it is impossible for the subsite 'owner' to restore from that backup.
The plugin could save all the tables in the WordPress SQL like
So all in all ... I think this is a nice to have but not sure if it's worth trying to develop it.