I usually do the sims upgrades on the first day of any holiday and generally stay 1 update behind... we hadn't any problems until I had to do one last monday(last week of term) ready for a visit from capita on thursday... we ended up unable to run/design reports until capita sorted out a patch for us yesterday morning :/ talk about worst possible timing.
The powers that be decided to do the new timetable the other day, but were worried they might make a mess of it so wanted a backup of the mornings work on the timetable before finishing it off. We usually only stop sims for backup at night, or just after everyone has left.
I thought timetables were part of Nova-T6? Which, if it is as it was 4 months ago, isn't part of the SQL database until you "commit" it. In which case a file-level backup of the timetable workstation and the fileserver would suffice.
That is, of course, unless you are committing it to SQL. :)