From f9ff2301e88faba989de7d267df90d126c838b72 Mon Sep 17 00:00:00 2001
From: Srigovind Nayak <5201843+konidev20@users.noreply.github.com>
Date: Sun, 5 Oct 2025 21:48:02 +0530
Subject: [PATCH] changelog: add a changelog entry for azure PutBlob API
 changes

---
 changelog/unreleased/issue-5531 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 changelog/unreleased/issue-5531

diff --git a/changelog/unreleased/issue-5531 b/changelog/unreleased/issue-5531
new file mode 100644
index 000000000..3cad4e624
--- /dev/null
+++ b/changelog/unreleased/issue-5531
@@ -0,0 +1,15 @@
+Enhancement: Reduce Azure storage costs by optimizing upload method
+
+Restic previously used Azure's PutBlock and PutBlockList APIs for all file
+uploads, which resulted in two transactions per file and doubled the storage
+operation costs. For backups with many pack files, this could lead to
+significant Azure storage transaction fees.
+
+Restic now uses the more efficient PutBlob API for files up to 256 MiB,
+requiring only a single transaction per file. This reduces Azure storage
+operation costs by approximately 50% for typical backup workloads. Files
+larger than 256 MiB continue to use the block-based upload method as required
+by Azure's API limits.
+
+https://github.com/restic/restic/issues/5531
+https://github.com/restic/restic/pull/5544