Hi there Eelco
I feel your pain. I hate having to share personal data and would like to know how it is stored and for how long.
At least using Cisco products you could be sure it is stored safely, as to how long here is the Cisco webex information about this
https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/webex-room-series/datasheet-c78-740772.pdf
Hope this helps
regards
Peter
There are worlds out there where the sky is burning, where the sea's asleep and the rivers dream, people made of smoke and cities made of song. Somewhere there's danger, somewhere there's injustice and somewhere else the tea is getting cold" Dr Who