I did try that one, I'll do so again.
Steps I used are:
1. Turn Off Switch, take out SDCard, insert into SDMicro-to SD Card Adapter
2. Insert into my Macbook (Running Windows 10) as it's the only device I have here with an SD Card Slot
3. Copy to SDCard:\switch\DIR FOR LG:P\BigPaul Saves\savdedata.bin
4. Eject SD Card
5. Load up Switch with Jig, inject payload, start Atmosphere
6. Albums, load Checkpoint
7. Restore savedata.bin for BigPaul
8. Restart Switch normally (no jig, atmosphere)
9. Load LG:P get corrupt data file error.
Hope this helps. If there's any better way of doing so please let me know.
Thanks for all your help.
Paul