diff --git a/README.md b/README.md
index 621e631..64b0efd 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,12 @@ GITEA_TOKEN=
 
 # Cron schedule
 CRON="0 */2 * * *"
+
+# Debug level
+DEBUG_LEVEL=debug
+
+# Only run one, skip cron and exit
+RUN_ONCE=1
 ```
 
 ## Known limitations
diff --git a/src/config.ts b/src/config.ts
index 3642334..f887607 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -35,5 +35,6 @@ export const Config = {
     token: simple('GITEA_TOKEN'),
   },
   cron: getEnv('CRON', '0 */2 * * *'),
+  runOnce: getEnv('RUN_ONCE', false, Boolean),
   version: getEnv('npm_package_version', 'unknown'),
 }
diff --git a/src/core.ts b/src/core.ts
index 619061f..7482c6d 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -18,10 +18,14 @@ export async function sync() {
     const toSync = await githubRepos()
     l.debug('loaded repos', { remote: toSync.length, local: syncedRepos.length })
 
+    // List of all the repos in gitea, that are not on github
+    const notInSource = new Set(syncedRepos.map((r) => r.name))
+
     for (const repo of toSync) {
       const lr = l.child({ repo: repo.name })
       const sameName = syncedRepos.find((r) => r.name === repo.name || r.original_url === repo.clone_url)
       if (sameName) {
+        notInSource.delete(sameName.name)
         if (sameName.original_url === repo.clone_url) {
           if (sameName.private === repo.private) logger.info('Already synced, skipping', { name: repo.name })
           else {
@@ -52,6 +56,9 @@ export async function sync() {
       await mirror(options)
       lr.info('mirrored repository')
     }
+    if (notInSource.size) {
+      l.info(`Found ${notInSource.size} surplus repositories in gitea`, { repos: [...notInSource] })
+    }
     l.info('Finished sync')
   } catch (error) {
     l.debug(error)
diff --git a/src/index.ts b/src/index.ts
index 4793f83..3a5d3dd 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -6,5 +6,13 @@ import { logger } from './logger.ts'
 
 logger.info(`Mirror manager - ${Config.version}`, { version: Config.version })
 
+Deno.addSignalListener('SIGINT', () => {
+  console.log('exiting...')
+  Deno.exit()
+})
+
+// Run on startup once, then delegate to cron
 await sync()
-cron.schedule(Config.cron, sync)
+if (!Config.runOnce) {
+  cron.schedule(Config.cron, sync)
+}