I have been testing pre/post commands since 2277; for details see here and here. With build 2323 I find: Pre and post commands of type .bat and .exe are correctly invoked. They are correctly passed arguments specified in the setup dialog Their return status is correctly recorded in the log. In addition, Shraddhan noted: I didn't attempt to test this setup, but I see in the log that the pre command is spawned immediately after the task starts, and before the "Analyzing partition..." messages, so maybe this is okay too. There is one problem remaining. Actually you might say "one problem introduced", because this feature worked correctly in builds 2277 and 2289. In those builds if the command returned a non-zero status TI would (correctly) interpret this as failure and would not continue the operation. In the current build the return status is noted in the log but the command is always logged as "succeeded" and the operation always continues. So the main issue is this: there is no way for a pre-backup command to abort the backup.