Yup.

Right on the first page (actually pg2 since pg1 is just the cover) it mentions the potential loss of data if the memory battery fails, and then on pg10, section 6.2 explains the memory battery is more detail, including the fact that it is expected to last for 5 years, and that all pre-programmed data will be lost if this battery fails. It also points out that if the battery fails while the TX is in operation, no loss of control will result (the main TX battery's power keeps the necessary info around) but the info will then be lost as soon as the TX is powered off.

BTW, for those who don't want to use the datasafe, or the written data sheets at the end of the manual, another option (which I use since I have never removed my datasafe from its box) is that you very easily can transfer the data from one TX to another .. so there are copies of my models on a buddy's TX, and vice-versa. Unles we both experience memory-battery failure at the same time (unlikely), we are protected. Still, the use of non-volatile memory would be a much better solution.

Gordon