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Have been getting a "Chunk Checksum Error -641" for several days now on a previously working script (out of six backup scripts that I run on 3 clients): + Normal backup using Bi-Weekly JaneiMac at 3/16/16, 22:00:00 (Activity Thread 1) To Backup Set iMac_Backup... - 3/16/16 22:00:00: Copying Macintosh HD on Jane's iMac 3/16/16 22:03:39: Found: 1351965 files, 317745 folders, 345.4 GB !Trouble matching Macintosh HD on Jane's iMac to iMac_Backup, error -641 (chunk checksum didn't match) Here's what I did so far: Repeated the script a couple of times to verify that the backup didn't take place and checked the drive condition to make sure the backup drive is operable. A very sensitive external test, DriveDX says there isn't a problem (SMART check). Haven't found the error code in Retro's own KB. Can't troubleshoot the issue further. Tried to perform a Recycle Backup manually. It seems not to run without the error so far... Does anyone know how this error started? Why it isn't documented anywhere? This situation seems typical of odd errors that occur from time to time. Don't seem to have any cause and when ignored seem to go away on their own. Sometimes a simple workaround like starting over clear it. Sometimes too a drive issue is the cause. That's why i went to SMART testing to confirm these kinds of drive related possibilities. Not so much in this case. H