diff --git a/src/backend/replication/basebackup.c b/src/backend/replication/basebackup.c
index a5c4a41..f01c136 100644
--- a/src/backend/replication/basebackup.c
+++ b/src/backend/replication/basebackup.c
@@ -81,14 +81,6 @@ static void SendXlogRecPtrResult(XLogRecPtr ptr, TimeLineID tli);
 static int	compareWalFileNames(const ListCell *a, const ListCell *b);
 static void throttle(size_t increment);
 static bool is_checksummed_file(const char *fullpath, const char *filename);
-static void initialize_manifest_checksum(ChecksumCtx *cCtx,
-										 ManifestCheckSum checksumAlgo);
-static void update_manifest_checksum(ChecksumCtx *cCtx,
-									 ManifestCheckSum checksumAlgo,
-									 const char *buf, off_t cnt);
-static int finalize_manifest_checksum(ChecksumCtx *cCtx,
-									  ManifestCheckSum checksumAlgo,
-									  char *checksumbuf);
 
 /* Was the backup currently in-progress initiated in recovery mode? */
 static bool backup_started_in_recovery = false;
@@ -2001,66 +1993,3 @@ throttle(size_t increment)
 	 */
 	throttled_last = GetCurrentTimestamp();
 }
-
-/*
- * Initialize the manifest checksum context according to the provided algorithm.
- */
-static void
-initialize_manifest_checksum(ChecksumCtx *cCtx, ManifestCheckSum checksumAlgo)
-{
-	switch (checksumAlgo)
-	{
-		case MC_SHA256:
-			pg_sha256_init(&cCtx->sha256_ctx);
-			break;
-		case MC_CRC32C:
-			INIT_CRC32C(cCtx->crc_ctx);
-			break;
-		case MC_NONE:
-			break;
-	}
-}
-
-static void
-update_manifest_checksum(ChecksumCtx *cCtx, ManifestCheckSum checksumAlgo,
-						 const char *buf, off_t cnt)
-{
-	switch (checksumAlgo)
-	{
-		case MC_SHA256:
-			pg_sha256_update(&cCtx->sha256_ctx, (uint8 *) buf, cnt);
-			break;
-		case MC_CRC32C:
-			COMP_CRC32C(cCtx->crc_ctx, buf, cnt);
-			break;
-		case MC_NONE:
-			break;
-	}
-}
-
-/*
- * Function calculate the final checksum for the provided context and returns
- * the length of checksum.
- */
-static int
-finalize_manifest_checksum(ChecksumCtx *cCtx,
-						   ManifestCheckSum checksumAlgo,
-						   char *checksumbuf)
-{
-	int checksumlen = 0;
-	switch (checksumAlgo)
-	{
-		case MC_SHA256:
-			pg_sha256_final(&cCtx->sha256_ctx, (uint8 *)checksumbuf);
-			checksumlen = PG_SHA256_DIGEST_LENGTH;
-			break;
-		case MC_CRC32C:
-			FIN_CRC32C(cCtx->crc_ctx);
-			pg_ltoa(cCtx->crc_ctx, checksumbuf);
-			checksumlen = strlen(checksumbuf);
-			break;
-		case MC_NONE:
-			break;
-	}
-	return checksumlen;
-}
diff --git a/src/common/Makefile b/src/common/Makefile
index ffb0f6e..b34ef41 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -47,6 +47,7 @@ LIBS += $(PTHREAD_LIBS)
 # If you add objects here, see also src/tools/msvc/Mkvcbuild.pm
 
 OBJS_COMMON = \
+	backup.o \
 	base64.o \
 	config_info.o \
 	controldata_utils.o \
diff --git a/src/common/backup.c b/src/common/backup.c
new file mode 100644
index 0000000..e6f3c37
--- /dev/null
+++ b/src/common/backup.c
@@ -0,0 +1,85 @@
+/*-------------------------------------------------------------------------
+ *
+ * backup.c
+ *		backup handling helpers
+ *
+ *
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/common/backup.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/backup.h"
+
+/*
+ * Initialize the manifest checksum context according to the provided algorithm.
+ */
+void
+initialize_manifest_checksum(ChecksumCtx *cCtx, ManifestCheckSum checksumAlgo)
+{
+	switch (checksumAlgo)
+	{
+		case MC_SHA256:
+			pg_sha256_init(&cCtx->sha256_ctx);
+			break;
+		case MC_CRC32C:
+			INIT_CRC32C(cCtx->crc_ctx);
+			break;
+		case MC_NONE:
+			break;
+	}
+}
+
+void
+update_manifest_checksum(ChecksumCtx *cCtx, ManifestCheckSum checksumAlgo, const char *buf, off_t cnt)
+{
+	switch (checksumAlgo)
+	{
+		case MC_SHA256:
+			pg_sha256_update(&cCtx->sha256_ctx, (uint8 *) buf, cnt);
+			break;
+		case MC_CRC32C:
+			COMP_CRC32C(cCtx->crc_ctx, buf, cnt);
+			break;
+		case MC_NONE:
+			break;
+	}
+}
+
+/*
+ * Function calculate the final checksum for the provided context and returns
+ * the length of checksum.
+ */
+int
+finalize_manifest_checksum(ChecksumCtx *cCtx, ManifestCheckSum checksumAlgo, char *checksumbuf)
+{
+	int checksumlen = 0;
+
+	switch (checksumAlgo)
+	{
+		case MC_SHA256:
+			pg_sha256_final(&cCtx->sha256_ctx, (uint8 *)checksumbuf);
+			checksumlen = PG_SHA256_DIGEST_LENGTH;
+			break;
+		case MC_CRC32C:
+			FIN_CRC32C(cCtx->crc_ctx);
+			sprintf(checksumbuf, "%u", cCtx->crc_ctx);
+			checksumlen = strlen(checksumbuf);
+			break;
+		case MC_NONE:
+			break;
+	}
+	return checksumlen;
+}
diff --git a/src/include/common/backup.h b/src/include/common/backup.h
new file mode 100644
index 0000000..98ca6b2
--- /dev/null
+++ b/src/include/common/backup.h
@@ -0,0 +1,45 @@
+/*
+ *	backup.h
+ *		backup handling helpers
+ *
+ *	Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+ *	Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *	src/include/common/string.h
+ */
+#ifndef COMMON_BACKUP_H
+#define COMMON_BACKUP_H
+
+#include "common/sha2.h"
+#include "port/pg_crc32c.h"
+#include "lib/stringinfo.h"
+
+/* Checksum algorithm option for manifest */
+typedef enum ManifestCheckSum
+{
+	MC_NONE = 0,
+	MC_SHA256,
+	MC_CRC32C
+} ManifestCheckSum;
+
+/* checksum algorithm context */
+typedef union checksumCtx
+{
+	pg_sha256_ctx sha256_ctx;
+	pg_crc32c	crc_ctx;
+} ChecksumCtx;
+
+/* Backup manifest info */
+typedef struct
+{
+	ManifestCheckSum checksumAlgo;
+	char		checksum_label[10];
+	ChecksumCtx cCtx;
+	StringInfo	manifest;
+} manifestinfo;
+
+extern void initialize_manifest_checksum(ChecksumCtx *cCtx, ManifestCheckSum checksumAlgo);
+extern void update_manifest_checksum(ChecksumCtx *cCtx, ManifestCheckSum checksumAlgo, const char *buf, off_t cnt);
+extern int finalize_manifest_checksum(ChecksumCtx *cCtx, ManifestCheckSum checksumAlgo, char *checksumbuf);
+
+#endif							/* COMMON_BACKUP_H */
diff --git a/src/include/replication/basebackup.h b/src/include/replication/basebackup.h
index 0b165e8..93fdb05 100644
--- a/src/include/replication/basebackup.h
+++ b/src/include/replication/basebackup.h
@@ -12,6 +12,7 @@
 #ifndef _BASEBACKUP_H
 #define _BASEBACKUP_H
 
+#include "common/backup.h"
 #include "common/sha2.h"
 #include "lib/stringinfo.h"
 #include "nodes/replnodes.h"
@@ -31,30 +32,6 @@ typedef struct
 	int64		size;
 } tablespaceinfo;
 
-/* Checksum algorithm option for manifest */
-typedef enum ManifestCheckSum
-{
-	MC_NONE = 0,
-	MC_SHA256,
-	MC_CRC32C
-} ManifestCheckSum;
-
-/* checksum algorithm context */
-typedef union checksumCtx
-{
-	pg_sha256_ctx sha256_ctx;
-	pg_crc32c	crc_ctx;
-} ChecksumCtx;
-
-/* Backup manifest info */
-typedef struct
-{
-	ManifestCheckSum checksumAlgo;
-	char		checksum_label[10];
-	ChecksumCtx cCtx;
-	StringInfo	manifest;
-} manifestinfo;
-
 extern void SendBaseBackup(BaseBackupCmd *cmd);
 
 extern int64 sendTablespace(char *path, char *oid, bool sizeonly,