The FR2LE does auto save. IIRC it writes the file once a minute so you should never lose more than 59 seconds*. Was at a festival Saturday and had my LE shutoff during the last act, restarted it and it shut off 4 minutes later. Swapped batteries and recorded the rest of the set. Got home and was missing less than four minutes of this artist. No problem since I also had the FR2 running; had planned to compare mics but forgot the FR2 was set at 24/88.2 and the LE was at 24/44.1. Using these particular batteries I got 3.7GB on one card at 24/48 and 1.6GB at 24/44.1
* Second Tip on page 62 of the manual: "The unit automatically closes the file every minute. Therefore, if unexpectable power failure or accident happens while operating the unit using the AC adaptor, you do not lose the data recorded before the trouble happens." I found the unit works the same way using batteries.
If you have access to a Windows box, look at the card with a program named Stellar Phoenix. It has seen files I haven't been able to find any other way. Search TS.com for the name or google Stellar Phoenix, note correct spelling may be Steller Phoenix but I believe it's the former.
< you will have to buy the program to recover any files but you can download and run the program for free to see if it can access them, if it can't no need to buy the program, if it can only you can decide whether the data is worth the price of the program. Good Luck >