diff --git a/src/backup.sh b/src/backup.sh
index 48a99c0..70040c6 100644
--- a/src/backup.sh
+++ b/src/backup.sh
@@ -3,16 +3,6 @@
 set -eu
 set -o pipefail
 
-if [ -z "$S3_ACCESS_KEY_ID" ]; then
-  echo "You need to set the S3_ACCESS_KEY_ID environment variable."
-  exit 1
-fi
-
-if [ -z "$S3_SECRET_ACCESS_KEY" ]; then
-  echo "You need to set the S3_SECRET_ACCESS_KEY environment variable."
-  exit 1
-fi
-
 if [ -z "$S3_BUCKET" ]; then
   echo "You need to set the S3_BUCKET environment variable."
   exit 1
@@ -50,8 +40,12 @@ else
 fi
 
 
-export AWS_ACCESS_KEY_ID=$S3_ACCESS_KEY_ID
-export AWS_SECRET_ACCESS_KEY=$S3_SECRET_ACCESS_KEY
+if [ -n "$S3_ACCESS_KEY_ID" ]; then
+  export AWS_ACCESS_KEY_ID=$S3_ACCESS_KEY_ID
+fi
+if [ -n "$S3_SECRET_ACCESS_KEY" ]; then
+  export AWS_SECRET_ACCESS_KEY=$S3_SECRET_ACCESS_KEY
+fi
 export AWS_DEFAULT_REGION=$S3_REGION
 export PGPASSWORD=$POSTGRES_PASSWORD
 
diff --git a/src/restore.sh b/src/restore.sh
index 634e136..9762afe 100644
--- a/src/restore.sh
+++ b/src/restore.sh
@@ -3,16 +3,6 @@
 set -u
 set -o pipefail
 
-if [ -z "$S3_ACCESS_KEY_ID" ]; then
-  echo "You need to set the S3_ACCESS_KEY_ID environment variable."
-  exit 1
-fi
-
-if [ -z "$S3_SECRET_ACCESS_KEY" ]; then
-  echo "You need to set the S3_SECRET_ACCESS_KEY environment variable."
-  exit 1
-fi
-
 if [ -z "$S3_BUCKET" ]; then
   echo "You need to set the S3_BUCKET environment variable."
   exit 1
@@ -52,8 +42,12 @@ else
 fi
 
 
-export AWS_ACCESS_KEY_ID=$S3_ACCESS_KEY_ID
-export AWS_SECRET_ACCESS_KEY=$S3_SECRET_ACCESS_KEY
+if [ -n "$S3_ACCESS_KEY_ID" ]; then
+  export AWS_ACCESS_KEY_ID=$S3_ACCESS_KEY_ID
+fi
+if [ -n "$S3_SECRET_ACCESS_KEY" ]; then
+  export AWS_SECRET_ACCESS_KEY=$S3_SECRET_ACCESS_KEY
+fi
 export AWS_DEFAULT_REGION=$S3_REGION
 export PGPASSWORD=$POSTGRES_PASSWORD