The PS3 Loader 1.1 is a plugin for IDA. IDA is a popular disassembler, which breaks down executables down to the machine code. This plugin recognizes code sections, and then identifies them as functions, among other things.
The Flow Rebuilder is a tool used by the PS3News DEV's that lets us reconstitute the PS3's flash dumps, which are separated across 2 chips, and stored "backwards". Think about it like shuffling two decks of cards, a red deck, and a blue, both upside down. When your done, it will be a nice deck that makes sense, but when you start it may be all over. It then lets us analyze certain files inside said dumps.
Basically, these tools in their current state have 0 to do with backups. The rebuilder works at the PS3's firmware, and the IDA plugin helps the DEV's examine already decrypted files!
A quick and simple explanation: