Sync 2 external hardrives onto only one of them

[cfcrule]

Hi

I have 2 hard drives one 8tb the other 4tb, they both have similar files but not exactly, so i need to read both and copy the result to one of the drives

Both have approx 3.7 tb of data so i want to clear one of those drives and copy all files except for duplicates to the other drive

Thank you in anticipation

[xCSxXenon]

Run an 'update' sync. That will transfer new/updated files to the destination without deleting anything in it. Always run a compare first to see what will happen

[cfcrule]

Brilliant thank you for that, i was pulling my hair out , have a great day