And again, files transferred through Windows Explorer and all other backup software I've used are copied/backed up at the full speed of whatever external backup drive is plugged in - this is an issue with FreeFileSync itself. These files are all locally stored on the PC, the processor is a Ryzen 5 3600, I'm running 16GB of RAM, and these files are being backed up from a Crucial P1 1TB NVMe SSD with sustained read speeds of 2 GB/s. Nothing I do changes the transfer speed it is always pegged at around 37 MB/s, and of course significantly slower when transferring lots of small files. When the sync started, the transfer rate was 1MB/s and slowly degraded to 150 KB/s. However, with the latest version 11.14, it is 100% consistent in transferring files about 4x slower than it should. Im syncing 2 million small files from a Windows 2008 server to a USB. To get full transfer speeds in previous versions, it variously required restarting FFS, reinstalling FFS, unplugging and re-plugging the external drive, or restarting the PC. The same file transferred manually through Windows Explorer at 120 MB/s will only transfer at maybe 37 MB/s when backing up through FreeFileSync. I understand that lots of little files are slow to transfer, especially when transferring to a hard drive, but I'm talking about the sustained transfer speed of large files (such as. FreeFileSync is -sometimes- significantly slower. I'm running Windows 10 and have a few different backup hard drives, all of which can easily maintain 100-130 MB/s writes over USB 3.0 - but only when copying files via Windows Explorer or another transfer program. However, I have a persistent issue with slow transfers which has been affecting me since I first started using FFS several versions ago. It's been the best backup software I've tried, and I've tried a lot. First, I want to say I really like FreeFileSync and use it weekly.
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