I'm considering moving my site to Silverstripe but need to do frequent exports of my member database. Is this possible/easy for a relatively un-techy person on the platform?
Yes this feature is built in and enabled by default. If you go to the security tab, select a group you can then click the 'Export to CSV' button below the table. In 2.4 you can also export all members at once rather than group by group.
How do you do that? there is no export button when you click on the "security groups" root user node, only the individual groups.