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.
Ona persists the whole disk through normal stops and offers class-dependent disk sizes. The reviewed guide recommends a larger class when space runs out, but does not establish automatic online growth of an existing complete RootFS.