Online RootFS growth
On growth-enabled images, Sandbox0 automatically expands the writable RootFS as free space runs low, within a configured sparse logical ceiling up to 64 TiB. Agent processes keep running. Growth is enabled in the qualified Cloud region; confirm activation for other regions. Existing images and snapshots retain their captured storage geometry. The ceiling is logical capacity, not preallocated host disk.
Zeabur service resource controls and provider server plans are separate from automatic online expansion of a complete durable writable agent RootFS. Persistent service-volume capacity does not make other runtime paths durable.