diff --git a/packages/bayc-watcher/src/cli/import-state.ts b/packages/bayc-watcher/src/cli/import-state.ts
index 729d3027..41d81a0a 100644
--- a/packages/bayc-watcher/src/cli/import-state.ts
+++ b/packages/bayc-watcher/src/cli/import-state.ts
@@ -71,10 +71,10 @@ export const main = async (): Promise<any> => {
 
   // Fill the snapshot block.
   await fillBlocks(
+    jobQueueConfig,
     jobQueue,
     indexer,
     eventWatcher,
-    jobQueueConfig.blockDelayInMilliSecs,
     {
       prefetch: true,
       startBlock: importData.snapshotBlock.blockNumber,
diff --git a/packages/bayc-watcher/src/fill.ts b/packages/bayc-watcher/src/fill.ts
index f20037c7..8f46d79b 100644
--- a/packages/bayc-watcher/src/fill.ts
+++ b/packages/bayc-watcher/src/fill.ts
@@ -49,6 +49,11 @@ export const main = async (): Promise<any> => {
       type: 'number',
       default: 10,
       describe: 'Number of blocks prefetched in batch'
+    },
+    backFill: {
+      type: 'boolean',
+      default: false,
+      describe: 'Fill blocks before latest indexed block'
     }
   }).argv;
 
@@ -76,7 +81,7 @@ export const main = async (): Promise<any> => {
 
   const eventWatcher = new EventWatcher(config.upstream, ethClient, indexer, pubsub, jobQueue);
 
-  await fillBlocks(jobQueue, indexer, eventWatcher, jobQueueConfig.blockDelayInMilliSecs, argv);
+  await fillBlocks(jobQueueConfig, jobQueue, indexer, eventWatcher, argv);
 };
 
 main().catch(err => {
diff --git a/packages/eden-watcher/src/cli/import-state.ts b/packages/eden-watcher/src/cli/import-state.ts
index b22f5fc5..935d2fb0 100644
--- a/packages/eden-watcher/src/cli/import-state.ts
+++ b/packages/eden-watcher/src/cli/import-state.ts
@@ -80,10 +80,10 @@ export const main = async (): Promise<any> => {
 
   // Fill the snapshot block.
   await fillBlocks(
+    jobQueueConfig,
     jobQueue,
     indexer,
     eventWatcher,
-    jobQueueConfig.blockDelayInMilliSecs,
     {
       prefetch: true,
       startBlock: importData.snapshotBlock.blockNumber,
diff --git a/packages/eden-watcher/src/fill.ts b/packages/eden-watcher/src/fill.ts
index b6f93651..66f48a26 100644
--- a/packages/eden-watcher/src/fill.ts
+++ b/packages/eden-watcher/src/fill.ts
@@ -56,6 +56,11 @@ export const main = async (): Promise<any> => {
       type: 'boolean',
       default: false,
       describe: 'Fill state for subgraph entities'
+    },
+    backFill: {
+      type: 'boolean',
+      default: false,
+      describe: 'Fill blocks before latest indexed block'
     }
   }).argv;
 
@@ -98,7 +103,7 @@ export const main = async (): Promise<any> => {
 
   const eventWatcher = new EventWatcher(config.upstream, ethClient, indexer, pubsub, jobQueue);
 
-  await fillBlocks(jobQueue, indexer, eventWatcher, jobQueueConfig.blockDelayInMilliSecs, argv);
+  await fillBlocks(jobQueueConfig, jobQueue, indexer, eventWatcher, argv);
 };
 
 main().catch(err => {
diff --git a/packages/erc20-watcher/src/fill.ts b/packages/erc20-watcher/src/fill.ts
index 03250034..5553b5a5 100644
--- a/packages/erc20-watcher/src/fill.ts
+++ b/packages/erc20-watcher/src/fill.ts
@@ -52,6 +52,11 @@ export const main = async (): Promise<any> => {
       type: 'number',
       default: 10,
       describe: 'Number of blocks prefetched in batch'
+    },
+    backFill: {
+      type: 'boolean',
+      default: false,
+      describe: 'Fill blocks before latest indexed block'
     }
   }).argv;
 
@@ -78,7 +83,7 @@ export const main = async (): Promise<any> => {
 
   const eventWatcher = new EventWatcher(config.upstream, ethClient, indexer, pubsub, jobQueue);
 
-  await fillBlocks(jobQueue, indexer, eventWatcher, jobQueueConfig.blockDelayInMilliSecs, argv);
+  await fillBlocks(jobQueueConfig, jobQueue, indexer, eventWatcher, argv);
 };
 
 main().catch(err => {
diff --git a/packages/erc721-watcher/src/cli/import-state.ts b/packages/erc721-watcher/src/cli/import-state.ts
index 729d3027..41d81a0a 100644
--- a/packages/erc721-watcher/src/cli/import-state.ts
+++ b/packages/erc721-watcher/src/cli/import-state.ts
@@ -71,10 +71,10 @@ export const main = async (): Promise<any> => {
 
   // Fill the snapshot block.
   await fillBlocks(
+    jobQueueConfig,
     jobQueue,
     indexer,
     eventWatcher,
-    jobQueueConfig.blockDelayInMilliSecs,
     {
       prefetch: true,
       startBlock: importData.snapshotBlock.blockNumber,
diff --git a/packages/erc721-watcher/src/fill.ts b/packages/erc721-watcher/src/fill.ts
index f20037c7..8f46d79b 100644
--- a/packages/erc721-watcher/src/fill.ts
+++ b/packages/erc721-watcher/src/fill.ts
@@ -49,6 +49,11 @@ export const main = async (): Promise<any> => {
       type: 'number',
       default: 10,
       describe: 'Number of blocks prefetched in batch'
+    },
+    backFill: {
+      type: 'boolean',
+      default: false,
+      describe: 'Fill blocks before latest indexed block'
     }
   }).argv;
 
@@ -76,7 +81,7 @@ export const main = async (): Promise<any> => {
 
   const eventWatcher = new EventWatcher(config.upstream, ethClient, indexer, pubsub, jobQueue);
 
-  await fillBlocks(jobQueue, indexer, eventWatcher, jobQueueConfig.blockDelayInMilliSecs, argv);
+  await fillBlocks(jobQueueConfig, jobQueue, indexer, eventWatcher, argv);
 };
 
 main().catch(err => {
diff --git a/packages/graph-test-watcher/src/cli/import-state.ts b/packages/graph-test-watcher/src/cli/import-state.ts
index b22f5fc5..935d2fb0 100644
--- a/packages/graph-test-watcher/src/cli/import-state.ts
+++ b/packages/graph-test-watcher/src/cli/import-state.ts
@@ -80,10 +80,10 @@ export const main = async (): Promise<any> => {
 
   // Fill the snapshot block.
   await fillBlocks(
+    jobQueueConfig,
     jobQueue,
     indexer,
     eventWatcher,
-    jobQueueConfig.blockDelayInMilliSecs,
     {
       prefetch: true,
       startBlock: importData.snapshotBlock.blockNumber,
diff --git a/packages/graph-test-watcher/src/fill.ts b/packages/graph-test-watcher/src/fill.ts
index bdb79f6e..e8cfc88d 100644
--- a/packages/graph-test-watcher/src/fill.ts
+++ b/packages/graph-test-watcher/src/fill.ts
@@ -50,6 +50,11 @@ export const main = async (): Promise<any> => {
       type: 'number',
       default: 10,
       describe: 'Number of blocks prefetched in batch'
+    },
+    backFill: {
+      type: 'boolean',
+      default: false,
+      describe: 'Fill blocks before latest indexed block'
     }
   }).argv;
 
@@ -85,7 +90,7 @@ export const main = async (): Promise<any> => {
 
   const eventWatcher = new EventWatcher(config.upstream, ethClient, indexer, pubsub, jobQueue);
 
-  await fillBlocks(jobQueue, indexer, eventWatcher, jobQueueConfig.blockDelayInMilliSecs, argv);
+  await fillBlocks(jobQueueConfig, jobQueue, indexer, eventWatcher, argv);
 };
 
 main().catch(err => {
diff --git a/packages/mobymask-watcher/src/cli/import-state.ts b/packages/mobymask-watcher/src/cli/import-state.ts
index 729d3027..41d81a0a 100644
--- a/packages/mobymask-watcher/src/cli/import-state.ts
+++ b/packages/mobymask-watcher/src/cli/import-state.ts
@@ -71,10 +71,10 @@ export const main = async (): Promise<any> => {
 
   // Fill the snapshot block.
   await fillBlocks(
+    jobQueueConfig,
     jobQueue,
     indexer,
     eventWatcher,
-    jobQueueConfig.blockDelayInMilliSecs,
     {
       prefetch: true,
       startBlock: importData.snapshotBlock.blockNumber,
diff --git a/packages/mobymask-watcher/src/fill.ts b/packages/mobymask-watcher/src/fill.ts
index f20037c7..8f46d79b 100644
--- a/packages/mobymask-watcher/src/fill.ts
+++ b/packages/mobymask-watcher/src/fill.ts
@@ -49,6 +49,11 @@ export const main = async (): Promise<any> => {
       type: 'number',
       default: 10,
       describe: 'Number of blocks prefetched in batch'
+    },
+    backFill: {
+      type: 'boolean',
+      default: false,
+      describe: 'Fill blocks before latest indexed block'
     }
   }).argv;
 
@@ -76,7 +81,7 @@ export const main = async (): Promise<any> => {
 
   const eventWatcher = new EventWatcher(config.upstream, ethClient, indexer, pubsub, jobQueue);
 
-  await fillBlocks(jobQueue, indexer, eventWatcher, jobQueueConfig.blockDelayInMilliSecs, argv);
+  await fillBlocks(jobQueueConfig, jobQueue, indexer, eventWatcher, argv);
 };
 
 main().catch(err => {
diff --git a/packages/util/src/fill.ts b/packages/util/src/fill.ts
index e72a4011..8f387954 100644
--- a/packages/util/src/fill.ts
+++ b/packages/util/src/fill.ts
@@ -8,24 +8,27 @@ import { JobQueue } from './job-queue';
 import { EventWatcherInterface, IndexerInterface } from './types';
 import { wait } from './misc';
 import { processBlockByNumberWithCache } from './common';
+import { indexBlock } from './index-block';
+import { JobQueueConfig } from './config';
 
 const log = debug('vulcanize:fill');
 
 const DEFAULT_PREFETCH_BATCH_SIZE = 10;
 
 export const fillBlocks = async (
+  jobQueConfig: JobQueueConfig,
   jobQueue: JobQueue,
   indexer: IndexerInterface,
   eventWatcher: EventWatcherInterface,
-  blockDelayInMilliSecs: number,
   argv: {
     startBlock: number,
     endBlock: number,
     prefetch?: boolean,
     batchBlocks?: number,
+    backFill?: boolean
   }
 ): Promise<any> => {
-  let { startBlock, endBlock, prefetch = false, batchBlocks = DEFAULT_PREFETCH_BATCH_SIZE } = argv;
+  let { startBlock, endBlock, prefetch = false, batchBlocks = DEFAULT_PREFETCH_BATCH_SIZE, backFill = false } = argv;
 
   if (startBlock > endBlock) {
     throw new Error(`endBlock ${endBlock} should be greater than or equal to startBlock ${startBlock}`);
@@ -38,7 +41,12 @@ export const fillBlocks = async (
       throw new Error(`startBlock should be greater than chain head ${syncStatus.chainHeadBlockNumber}`);
     }
 
-    await prefetchBlocks(indexer, blockDelayInMilliSecs, { startBlock, endBlock, batchBlocks });
+    await prefetchBlocks(indexer, jobQueConfig.blockDelayInMilliSecs, { startBlock, endBlock, batchBlocks });
+    return;
+  }
+
+  if (backFill) {
+    await backFillBlocks(indexer, jobQueConfig.eventsInBatch, { startBlock, endBlock });
     return;
   }
 
@@ -143,3 +151,16 @@ const prefetchBlocks = async (
     }
   }
 };
+
+const backFillBlocks = async (
+  indexer: IndexerInterface,
+  eventsInBatch: number,
+  { startBlock, endBlock }: {
+    startBlock: number,
+    endBlock: number
+  }
+) => {
+  for (let i = startBlock; i <= endBlock; i++) {
+    await indexBlock(indexer, eventsInBatch, { block: i });
+  }
+};