| Feature / Fix | Build 39161 (Initial) | Build 39216 (Pre-Patch) | Build 39216 Patch B | |---------------|----------------------|-------------------------|---------------------| | Windows 21H1 support | Buggy (BSOD risk) | Partial | Full | | Ransomware false positives | High | Medium | Very Low | | NVMe backup speed | ~150 MB/s | ~200 MB/s | ~280 MB/s | | Cloud sync stability | Unstable | Improved | Stable | | Security patches | Missing | Missing | Included | | VSS timeout errors | Frequent | Occasional | Rare |

As you can see, Patch B transforms Build 39216 into the most reliable version of Acronis True Image 2021.

The primary "features" of this patch are fixes for critical issues present in previous builds (specifically builds 39287 and earlier).

An algorithm error in earlier builds caused poor backup speeds on certain PCIe 4.0 NVMe SSDs. Build 39216 Patch B optimizes I/O requests, increasing speeds by up to 30% on high-performance drives.