Is there a way to transfer graphs1090 history to a new install?

As above.
I wish to retain the history with a rebuilt system.
Can it be done?

It’s in the github readme: GitHub - wiedehopf/graphs1090: Graphs for readsb / dump1090-fa / dump1090 (based on dump1090-tools by mutability)

Thank you wiedehopf
I’ll try that in the morning.
Note to self, RTFM.

It hasn’t been there for long, maybe it’s not a complete enough guide either.

In that case me or someone else may be able to assist further.

The “Backup and Restore (same architecture)” sort of works as suggested one I spotted the missing “c” in sudo systemtl restart collectd

The 14, 30 day and 1, 2 & 3 year graphs didn’t transfer.

Any suggestions?

This was a new installation under Buster.

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They did, just restart graphs1090 to redraw the graphs (or reboot).

You are correct.
After a reboot and a cache refresh all is working correctly.
Thank you.