Automating What Backblaze Lifecycle Rules Don't Do Instantly

I recently moved from Synology to TrueNAS and set up cloud backups to Backblaze B2. I have two buckets: one for important files like documents, and one for homelab services. The services bucket backs up things like qcow2 disk images for my VMs, some of which are hundreds of gigabytes.

When I created the buckets, I set the lifecycle rule to “Keep only the last version of the file.” I assumed this meant Backblaze would automatically replace old versions when new ones arrived. It doesn’t work that way.