ZFS will let you setup a RAID like set of small volumes which mirror one larger volume, it takes some setup, but that’s the most “elegant” solution in that once it’s configured you only need to touch it when you add a volume to the system and it’s just a mounted filesystem that you use.
Does not solve the off-site problem, one fire and it’s all gone.
There is a huge overlap between people who would participate in Antifa and Anarchists, so you can imagine the problems getting a structured organization setup and keeping on task and purpose.