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The content rollback wiki-style is very cool...
I'd go one further is possible....system rollback.
I just had a bit of a go with the 2.0.14 to 2.0.15 upgrade...
Messed up various aspects of three key modules I use...
A one button rollback to a previous state would be very cool and make frequent updating non-problematic (relatively speaking)....
That's a big chuck....but content versioning would be equally cool...
(I just test drove Drupal 4.7.....and decided to stay with XOOPS...)
Just had another thought along those lines...CRONable backups?
FTP doesn't copy correct....can php copy files?
Moo.