Identify the two storage targets
The PC-FX developer FX-BMP reference documents internal backup memory and the external FX-BMP accessory, plus BIOS copying and moving between them. Some games access external storage directly while others require management through the system. Inspect the individual game's save instructions and the selected destination before concluding that a save has disappeared.
Photograph the current memory-manager entries and record their game titles, editions and recognizable progress. Check free space without choosing format. A copy operation and a move operation have different consequences; preserve the source until the destination has been verified in the game. If a game needs more space, do not delete another entry merely as an experiment.
Use a tested preservation workflow
- Identify every valuable internal and external entry.
- Use the documented system manager to copy a disposable test save to compatible external storage.
- Verify that the expected entry is visible at the destination.
- Load it through the supported game workflow and check actual progress.
- Repeat for valuable data, preserving the original wherever possible.
An FX-BMP copy is a useful second storage location, but a computer archive needs its own documented extraction and restore method. Use a tool only if it explicitly supports the accessory and memory format. Retain the first image, file size, checksum, tool version and a working copy. A successful ROM extraction is not evidence that save extraction works. Read twice and compare when practical before writing back.
Understand internal retention
The original FRAM upgrade author describes supercapacitor-backed internal SRAM and warns that long periods without power can lose its contents. The author does not establish that merely leaving the console plugged in while off guarantees retention. Do not turn that uncertainty into a preservation promise. Keep a verified copy of valuable saves before long-term storage or hardware work.
The documented FRAM conversion replaces the storage chip and therefore requires preservation first. Match the board, original chip, package and replacement part to the write-up and current part documentation. This is surface-mount rework, with orientation, pad integrity and short-circuit inspection essential. Do not replace an arbitrary nearby component or assume that all nonvolatile memories are pin-compatible. Read the entire original procedure before ordering parts.
Verify after a modification
Initial formatting after storage replacement destroys the new chip's current contents; it should follow an intentional backup and restore plan. Create a disposable save, shut down normally, wait and verify that it remains. Then restore and load a working copy of the preserved data using the supported workflow. Keep the last verified archive until all intended games load correctly.
For emulation, the Mednafen PC-FX documentation distinguishes internal and external backup-memory emulation. Archive its relevant files and configuration separately from physical hardware data. Emulator save states are not the same as native save files. Record which format and environment each backup actually restores, so later migration does not rely on filenames alone.