What’s the recommended backup strategy

Put your agent workspace in a private git repo and back it up somewhere private (for example GitHub private). This captures memory + AGENTS/SOUL/USER files, and lets you restore the assistant’s “mind” later.
Do not commit anything under ~/.openclaw (credentials, sessions, tokens). If you need a full restore, back up both the workspace and the state directory separately (see the migration question above).
Docs: Agent workspace.