QSync deleted all my Sync Folder and Files on Both of PC and NAS

[JohnNap]

BTW incase you wonder why I do not need help, I use Time Machine from QNap to recovered all the deleted files.

[FSC830]

In that case you should give some details of your used versions and configuration too to find (may be) a common cause.
Just writing "having the same issue" is not a valuable information and all remains in guesswork.

BTW: seen many posts "having same issue" here and digging in shows finally its the same outcome, but a totally different cause.

Using of TimeMachine i.e. indicates you running a Mac OS, whereas the OP used Win10.
So its most likely not the same issue, but the same outcome.

Regards