Why the file in the source folder be deleted?

[i-Ask]

Since I was doing a one way sync. why did it delete files on the source machine?
How can I prevent this but still get file deleted off the backup or output folder when they are deleted
on the source?

[RiseFly]

In one-way sync, BestSync will never delete the file in the source folder, except that you have selected the following options:

If you have any questions, comments, concerns, please simply contact risefly@risefly.com.