There is a bug in the filter GUI builder that causes extra backslashes to be added, sometimes rendering the filter ineffective. There is a fix in the Canary channel but you shouldn’t switch to that channel unless you don’t mind added risk.
In the meantime, I recommend using the “Edit as text” option (click the 3 dot menu to the right of the filter option) and manually entering your filters. Here’s how you’d filter out folders whose names contain ‘Debug’ or ‘Release’:
-*Debug*\
-*Release*\
By the way, don’t switch back to Edit as list to see what it looks like - that action can foul up the filters in the current beta version. Leave it on Edit as text and save your backup job config.