There isn't a custom recovery written for the mez just yet, and I don;t recommend you keep trying ones for other phones -- better safe than sorry.
Titanium backup from the market will backup all you apps, app data, and system settings to the SD card, and the pro version will back it all up to dropbox. Best solution I can think of for now.
I'm not trying to use custom recoveries written for other phones. At least I don't think I am. If it says anything about a specific phone, like clockworkmod, I'm not using it. SPRecovery hadn't said anything about being phone specific anywhere. Since I wasn't trying to flash a new ROM, just trying to take a backup of mine, I thought it would be an ok choice. I guess I just need to wait it out or brush up on my coding.
-edit
OK, now that I look deeper into things I think I see where I was mistaken. Looking deeper into the recovery and some of the ROMs, I'm (kinda) seeing how these things are all put together now. Even the sister ROMs (like Fascinate and Mesmerize) aren't put together even close to the same and recovery files aren't in the same directories. So luckily most of the times trying to flashing a new recovery tool like SPRecovery would just fail. If it did work, you would probably be screwed anyway because things would be in the wrong place.
Anyway, I'm learning.