Keep multiple Google Sheets automatically in sync

flowchart TD trig(["every few minutes schedule"]):::trigtime s0["Check source sheet"]:::task s1["Read current source data"]:::task s2[("Write to sheet copies")]:::store trig --> s0 s0 --> s1 gx{"+ which sheets to update"}:::gate s1 --> gx p00["write data to sheet A"]:::task gx -->|"first copy sheet"| p00 p10["write data to sheet B"]:::task gx -->|"second copy sheet"| p10 p00 --> s2 p10 --> s2 out[/"Two spreadsheets updated to match source"/]:::out pay{{"All sheets always show same numbers"}}:::pay s2 --> out out --> pay classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff