HotSync Reminder 1.2.1
the author of this app says:
You've harnessed the power of your PalmB handheld to remind you of just about everything in your life. Now let it remind you when it's time to back up all of those other reminders. Simply specify how often you want to be reminded to HotSync. Then, every time you turn on the device, it will check the last HotSync time and warn you if it's been too long. There's also a snooze feature in case you want to procrastinate.
The updated version runs much faster.