Hard drive erased during synchronization.

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Posts: 1
Joined: 28 Jun 2026

patoDK

I just tried synchronizing two external drives. There was about 1Tb of data going one way and 600Gb going the other way. I've done this in the past, so I didn't think too much about it and let it run over night. I woke up to a couple of errors, but nothing that stood up. I ignored them and the process continued. When it was done I did a quick review of the log and again, nothing stood up. I closed it and I went to finder to check the folders and found out one of the disks was completely erased. The other drive seems to have all the files. I am not panicking because I have a 3rd copy of the data and the data is no too sensitive.

Did I click something I shouldn't have? Should I be worried bout using FreeFileSync?

I'm on a MacBook Pro M4 Max, MacOs Tahoe 26.5.1, FreeFileSinc 14.6 ARM64.
Posts: 4908
Joined: 11 Jun 2019

xCSxXenon

Yes, you clicked something you shouldn't have.
No, I don't know what.
Only be worried if you don't trust yourself, FFS has yet to be the cause of this in the last seven years I've been on the forum
User avatar
Posts: 2978
Joined: 22 Aug 2012

Plerry

When in doubt, run (just) a Compare, review the proposed sync actions, and only if those proposed sync actions match your intended sync actions click Synchronize.