diff --git a/local-backup b/local-backup
index 0c12b935..3fcd5240 100755
--- a/local-backup
+++ b/local-backup
@@ -11,7 +11,7 @@ ssh $remote "mkdir local-backup"
 ssh $remote "mkdir local-backup/$timestamp"
 ssh $remote "sqlite3 attestation.db \".backup local-backup/$timestamp/attestation.db\""
 ssh $remote "sqlite3 samples.db \".backup local-backup/$timestamp/samples.db\""
-ssh $remote "tar -cC local-backup $timestamp | zstd -9 | age -r \$(cat backup-public-key.txt) -o local-backup/$timestamp.tar.zst.age"
+ssh $remote "tar -cC local-backup $timestamp | zstd --single-thread -9 | age -r \$(cat backup-public-key.txt) -o local-backup/$timestamp.tar.zst.age"
 rsync -v --fsync --preallocate $remote:./local-backup/$timestamp.tar.zst.age backup/
 
 ssh $remote "rm -rf local-backup"
diff --git a/remote-backup b/remote-backup
index 7c97f758..4d57e5a8 100755
--- a/remote-backup
+++ b/remote-backup
@@ -9,7 +9,7 @@ mkdir remote-backup
 mkdir remote-backup/$timestamp
 sqlite3 attestation.db ".backup remote-backup/$timestamp/attestation.db"
 sqlite3 samples.db ".backup remote-backup/$timestamp/samples.db"
-tar -cC remote-backup $timestamp | zstd -9 | age -r $(cat backup-public-key.txt) -o remote-backup/$timestamp.tar.zst.age
+tar -cC remote-backup $timestamp | zstd --single-thread -9 | age -r $(cat backup-public-key.txt) -o remote-backup/$timestamp.tar.zst.age
 sshpass -f cloud-archive-password.txt rsync -v ./remote-backup/$timestamp.tar.zst.age pca@gateways.storage.gra.cloud.ovh.net:backup/
 
 rm -rf remote-backup