I've been doing some research about PBR since yesterday, and found some really interesting stuff.
The save file, which is location is "nand:/title/00010000/52504250/data/GeniusPbr/PbrSaveData" is made of two contiguous "save slots" ("current" and "backup"), each one being 0x1c0000 bytes of size. It turns out that they are encrypted the same way save slots are.
The encryption/decryption/checksum calculation routines can be here.
Without further ado, here is what I know about the various struc