RAID 1 - empty folders after last backup - - how ?

2 days ago I plug my RAID1 into my Windows 10 to do backup > browse to my phone folder > as I click into it, the loading begins > loads for perhaps 20 mins > after it loads, everything seems normal > back up all my pics/vids > eject the drive safely > unplug.

last night I plug the same RAID1 external enclosure into the same W10 PC > phone dir i did backup to is empty + Backup dir elsewhere empty. my Backup dir had TONS of stuff, probably around 200-300gb of data. the phone folder had ALL of its contents gone. I spent at least the last week backing up new data from my phone. so that, AND the data i previously backed up for the last 4-5 years. all gone! I took out both HDDs out of RAID1 enclosure, and the 2 folders are empty in BOTH of them!

i am running data recovery as i type this, and luckily had another backup from 5 months ago on another device, but what do you think happened?

Setup: RAID1 of 2 mirrored 2TB HDDs, ExFat format (i use linux and windows, so needed a format...

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