Tell users to back up their database before upgrading their sites.
Tell users to back up their database before upgrading their sites.

We do this when we're answering people's questions on the mailing list, so we
should probably do so in the docs as well.

1tush/reviewboard,chipx86/reviewboard,chipx86/reviewboard,sgallagher/reviewboard,davidt/reviewboard,chipx86/reviewboard,custode/reviewboard,1tush/reviewboard,custode/reviewboard,chipx86/reviewboard,bkochendorfer/reviewboard,sgallagher/reviewboard,reviewboard/reviewboard,KnowNo/reviewboard,bkochendorfer/reviewboard,1tush/reviewboard,brennie/reviewboard,1tush/reviewboard,brennie/reviewboard,KnowNo/reviewboard,reviewboard/reviewboard,1tush/reviewboard,sgallagher/reviewboard,1tush/reviewboard,sgallagher/reviewboard,beol/reviewboard,davidt/reviewboard,bkochendorfer/reviewboard,beol/reviewboard,KnowNo/reviewboard,davidt/reviewboard,custode/reviewboard,reviewboard/reviewboard,brennie/reviewboard,1tush/reviewboard,beol/reviewboard,1tush/reviewboard,custode/reviewboard,KnowNo/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,davidt/reviewboard,beol/reviewboard,brennie/reviewboard,reviewboard/reviewboard