Have you tried temporarily turning off all your plugins to rule out a plugin related issue?
“In preparing to upgrade” — why? Are you doing upgrades manually? WordPress handles upgrades quite nicely on its own without any worries.
If you are backing up a site, you might want to look into exporting the database through phpMyAdmin (it’s simple, really). Or you could look at something like Ipstenu’s DreamObjects Backups plugin. That’s the cheapest automated option I’ve found, and I use it on my dozen+ WordPress sites.
This isn’t a plugin issue, although yes I have tried that on a couple of sites.
I use the xml as a backup along with the database sql down load.
I did try just doing incremental xml export files, and that worked on a couple of sites, so I will do it that way for now. It’s a pita as they are all called the same thing. And there is no reason that the whole file shouldn’t download, these are tiny sites.
Mika’s plugin looks great, if you are a dream host client.
My hosts take many back ups, but I always like to have my own copies just in case.
Guess I will have to either do full backups through CPanel, or install yet again another plugin.
Thanks.