When you start a trial in Gearset you have the option to choose the data storage location of your Gearset app, depending on your needs.
To check your data storage location, click the menu icon in the top-left corner of Gearset.
The click the Account name and look for Data storage at the bottom. The label shows your region, such as EU, US, Australia or Canada.
For Gearset Data Backup: Backup data is stored in the AWS region selected for your Gearset account: US West 2, EU West 1 (Ireland), AP Southeast 2 (Australia), or CA Central 1 (Canada).
The Gearset EU data center is located in Ireland. More specifically, the AWS data center handling the EU region for Gearset is in Dublin.