What happens to files that were being transferred when you stop a sync

[Tad905]

Hi All,

I have 2 external backup drives. I tried the "versioning" feature for the first time. I did a compare using "File Content" due to windows messing up my "modified dates" on one of the drives.

After the compare was finished. I started the mirror sync from my first backup drive to my second backup drive. I also realized that this program does not warn you if it plans to copy more data than the free space allows. Remembering this after I already clicked "Sync", I looked at the data size it was sending over. Over 2TB, I panicked as it shouldn't be that much and hit "Cancel". Checked the second drive and realized that 2TB was in fact in the ballpark of what it should be. I hit "sync" again.

What happens to the files that were already processed when I hit cancel? Are there going to be some files that were partially transferred? Is my backup going to be imperfect because of these files now? I would start again, but I'm not just mirroring it. I wanted to do this compare to save a version of the old files into a separate directory. If I delete everything on the second drive and mirror the first drive to it, I'll lose those old versions of the files. But I'm concerned after this current process finishes (another 13h from now) that I'll have an imperfect mirror or an imperfect set of "old files" in my "version" folder because of the "Cancel" and "Sync" I did after the 3-4% was already underway syncing.

[xCSxXenon]

If all you did was cancel and then start again, FFS just picks up where it left off. Canceling a sync doesn't undo anything already processed, it just doesn't continue with the remaining queued up. FFS won't stop anything mid-progress or leave remnants, it will wait until everything is in a 'steady-state' before actually stopping and returning you back to the overview screen.