@rolle 1TB of assets? That's inmense for a 4 user instance I'm currently at 25Gb and have like 10-12 relays.
What does your cronjob to delete assets look like?
Here's mine: https://ricard.dev/improving-mastodons-disk-usage/
The only reason to change to an S3 would be reduce the storage cost. Not sure what's your deal with Hetzner but usually dedicated S3 object storage is just cheaper than regular SSD's.