During an attempt to make Windows search not be so horrible by reindexing all the drives on Nebula Core, something happened all I know at this point) that caused a large amount of corruption on the SSD storing several virtual machines. Unfortunately, they may not be recoverable. There shouldn't be any permanent data loss, but the configuration for NextCloud, mFi, UniFi, Active Directory, as well as several smaller services was completely erased... unless I get really lucky. I'm attempting recovery now, but things may be down for quite awhile given the busier-than-average time of the year and the large amount of time that'll need to be invested to reconfigure everything. Ugh. Definitely not cool.