dont' get stuck if backend is not supported

src/backend.ts

@@ -43,6 +43,7 @@ export const getBackendsFromLocations = (locations: Locations): string[] => {
 
 export const checkAndConfigureBackend = (name: string, backend: Backend) => {
 	const writer = new Writer(name.blue + ' : ' + 'Configuring... ⏳')
+	try {
 		const env = getEnvFromBackend(backend)
 
 		const { out, err } = exec('restic', ['init'], { env })
@@ -53,6 +54,9 @@ export const checkAndConfigureBackend = (name: string, backend: Backend) => {
 		if (VERBOSE && out.length > 0) console.log(out)
 
 		writer.done(name.blue + ' : ' + 'Done ✓'.green)
+	} catch (e) {
+		writer.done(name.blue + ' : ' + 'Error ⚠️ ' + e.message.red)
+	}
 }
 
 export const checkAndConfigureBackends = (backends?: Backends) => {