diff --git a/README.md b/README.md
index 2d6d72f..dfe71f7 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,15 @@ AWS_S3_BUCKET_NAME="<xxx>"
 # Backups can be encrypted using gpg in case a passphrase is given
 
 # GPG_PASSPHRASE="<xxx>"
+
+########### MINIO CLIENT CONFIGURATION
+
+# Pass these additional flags to all MinIO client `mc` invocations.
+# This can be used for example to pass `--insecure` when using self
+# signed certificates, or passing `--debug` to gain insights on
+# unexpected behavior.
+
+# MC_GLOBAL_OPTIONS="<xxx>"
 ```
 
 ## Example in a docker-compose setup
diff --git a/src/backup.sh b/src/backup.sh
index 610a53f..1e9f584 100644
--- a/src/backup.sh
+++ b/src/backup.sh
@@ -58,7 +58,7 @@ fi
 if [ ! -z "$AWS_S3_BUCKET_NAME" ]; then
   info "Uploading backup to remote storage"
   echo "Will upload to bucket \"$AWS_S3_BUCKET_NAME\"."
-  mc cp "$BACKUP_FILENAME" "backup-target/$AWS_S3_BUCKET_NAME"
+  mc cp $MC_GLOBAL_OPTIONS "$BACKUP_FILENAME" "backup-target/$AWS_S3_BUCKET_NAME"
   echo "Upload finished."
 fi
 
@@ -76,14 +76,14 @@ if [ ! -z "$BACKUP_RETENTION_DAYS" ]; then
   sleep "$BACKUP_PRUNING_LEEWAY"
   bucket=$AWS_S3_BUCKET_NAME
 
-  rule_applies_to=$(mc rm --fake --recursive -force --older-than "${BACKUP_RETENTION_DAYS}d" "backup-target/$bucket" | wc -l)
+  rule_applies_to=$(mc rm $MC_GLOBAL_OPTIONS --fake --recursive -force --older-than "${BACKUP_RETENTION_DAYS}d" "backup-target/$bucket" | wc -l)
   if [ "$rule_applies_to" == "0" ]; then
     echo "No backups found older than the configured retention period of $BACKUP_RETENTION_DAYS days."
     echo "Doing nothing."
     exit 0
   fi
 
-  total=$(mc ls "backup-target/$bucket" | wc -l)
+  total=$(mc ls $MC_GLOBAL_OPTIONS "backup-target/$bucket" | wc -l)
 
   if [ "$rule_applies_to" == "$total" ]; then
     echo "Using a retention of ${BACKUP_RETENTION_DAYS} days would prune all currently existing backups, will not continue."
@@ -91,6 +91,6 @@ if [ ! -z "$BACKUP_RETENTION_DAYS" ]; then
     exit 1
   fi
 
-  mc rm --recursive -force --older-than "${BACKUP_RETENTION_DAYS}d" "backup-target/$bucket"
+  mc rm $MC_GLOBAL_OPTIONS --recursive -force --older-than "${BACKUP_RETENTION_DAYS}d" "backup-target/$bucket"
   echo "Successfully pruned ${rule_applies_to} backups older than ${BACKUP_RETENTION_DAYS} days."
 fi
diff --git a/src/entrypoint.sh b/src/entrypoint.sh
index dedd7e0..9ab550a 100644
--- a/src/entrypoint.sh
+++ b/src/entrypoint.sh
@@ -21,11 +21,13 @@ AWS_S3_BUCKET_NAME="${AWS_S3_BUCKET_NAME:-}"
 AWS_ENDPOINT="${AWS_ENDPOINT:-s3.amazonaws.com}"
 
 GPG_PASSPHRASE="${GPG_PASSPHRASE:-}"
+
+MC_GLOBAL_OPTIONS="${MC_GLOBAL_OPTIONS:-}"
 EOF
 chmod a+x env.sh
 source env.sh
 
-mc alias set backup-target "https://$AWS_ENDPOINT" "$AWS_ACCESS_KEY_ID" "$AWS_SECRET_ACCESS_KEY"
+mc $MC_GLOBAL_OPTIONS alias set backup-target "https://$AWS_ENDPOINT" "$AWS_ACCESS_KEY_ID" "$AWS_SECRET_ACCESS_KEY"
 
 # Add our cron entry, and direct stdout & stderr to Docker commands stdout
 echo "Installing cron.d entry with expression $BACKUP_CRON_EXPRESSION."