Upgrading from 2.0.0-beta.16 to 2.7.1

I can't seem to find a sensible upgrade path.
This no longer exists:
https://docs.influxdata.com/influxdb/v2.0/reference/rc0-upgrade-guide/

This page:
https://docs.influxdata.com/influxdb/v2/upgrade/v2-to-v2/?t=Linux
has a link to:
https://docs.influxdata.com/influxdb/v2/upgrade/v2-beta-to-v2/
which no longer exists.

And as per this issue:
https://github.com/influxdata/influxdb/issues/23102
Backup/restore doesn't work.

What are my options?

Start by checking the current v2-to-v2 upgrade page and the missing v2-beta-to-v2 and rc0-upgrade-guide links, then read issue #23102 about backup/restore. Done means the documentation provides a verified upgrade path or clearly states the supported options for users moving from 2.0.0-beta.16 to 2.7.1.

Written by the indexing model from the issue text.