I've used the following bit of Applescript for years to trigger Time Machine from within an Applescript. It no longer seems to work in Mavericks. Anyone know of a solution or alternative. This script runs and does not throw any error messages. It simply does nothing.
do shell script "/System/Library/CoreServices/backupd.bundle/Contents/Resources/backupd-helper >/dev/null 2>&1 &"
do shell script "/System/Library/CoreServices/backupd.bundle/Contents/Resources/backupd-helper >/dev/null 2>&1 &"