Filesystem & backend options for embedded openldap

I'm working on an embedded system for which I would like to use openldap as the means of config storage. I've spent a lot of time RTFM'ing and still feel that there is a lot that is escaping me as far as the optimal configuration.

If the primary goal is data safety and zero human intervention, what would be the optimal combination of file system / backend storage / and config options?

I would like to never have to manually recover a database and have it gracefully recover from power failures. Speed is not an issue as it's very low traffic. Integritiy is everything. It's target storage is a USB flash device. Are there any special considerations WRT flash storage and ldap?

Thanks in advance.

-Bruce