Something is filling my hard drive

I connected to the drive and looked at the host files, I see a ton of what look like Docker images and containers. I made a backup of the system and wiped the drive. Now I’m down to about 5gbs of used space.

can u explain in more detail?
i followed spaceinvaderone:s guide on youtube and have hassio on VM on Unraid and experience problem with HA say disk is full when i have a 32gig vm drive and cant find anything taking that kind of space when i poke around.

I use an automated nightly backup. I was sitting at 97% full. Went to system>backup and selected all, then unchecked the backups from the last week. hit deleted all marked. went to 17% wow