Yes, you can export all of your data at any time, and for your complete peace of mind we would encourage that you do so regularly, e.g. at the end of each month.The data can be exported in the commonly used Excel-readable CSV file format.
Elevate enables export of account data via the Settings > Agency settings > Data Exports menu at any time. That data can then be backed up locally within your own organisation as part of your standard data backup processes.
But, be aware that exports are for your own use and are independent of any software system. They will most likely not be able to be imported directly into another system with some work from a developer, but at least you have a full useful copy of all your data.
You can also export data from specific pages, e.g. properties, landlords or tenants, via Options > Export CSV.