Influxdb hassio addon moving from one ha install to another (without backup)

Any one is aware how to move the influxdb (and grafana) hassio addon from one supervised install to another without utilizing the backup function?

I can’t make use of the backup because the internal disk (soldered eMMC) is almost full and the backup function doesn’t allow to use a external disk 🤦.

Both of the ha installs are supervised so I have access to the OS layer and the ha layer (using the ssh addon).

Any help very much appreciated.