At $19.95, JackBack is a steal. I originally bought a Handspring Backup Module for $45, and backed up religiously, and generally worried about losing data while on the road. Since then I starting using larger databases on the 16meg Flash, and swapping modules in and out of the Visor. Now, with JackBack, I use the 16meg module exclusively, with my unattended backups and other data sharing space. JackBack has saved my butt a few times, sparing me at least a few days of data and notes. I look forward to their CompactFlash support, and I hope their continue to support other Visor-specific memory solutions like the MemoryStick Springboard Module, and the MemPlug SmartMedia module. If you have a Flash Module already, pickup JackBack. If you are looking for a combination storage and backup solution, JackBack is a welcome addition to your Visor software library.

Criteria  Rating Design 4 Usefulness 5 Usability 5 Cost/Benefit 5 Overall (not an average)	Pros - Schedule Unattended Backups - Complete control of what gets backed-up - Simple UI - Compression Library - Works with all Flash Modules, with CF support soon - Flexible PlugIns allow for new storage types - Great Documentation
	Cons - Doesn't work with the Handspring Backup Module - No progress bar during long operations - Not incredibly fast