I'm running a small EC2 instance, with 16 GB EBS volume attached and mounted as /dev/sdf (the boot disk is a different EBS volume). Two days ago I did a reboot of the instance from AWS management console to preempt a scheduled reboot. Just noticed that my volume, although still attached and functional, seems to have been wiped as of two days ago (the main thing I have on there is a sqlite database... my application automatically recreates the database if it's not there, and what I'm seeing is the database having data for the last two days but nothing before that. There were a couple other files on the volume that are now missing).
The reboot is the only thing I can think of that could have caused this. Not sure what the next steps are to diagnose out how this happened, any advice?