If I delete my folder pairs (SyncToy 2.0), will my original data (the left folder) be intact? and if I uninstall SyncToy 2.0, will my original data still be intact? ( as if SyncToy was never installed)
Deleting a folder pair or uninstalling SyncToy will not affect any of data in any way. They will be left in the same state they were in at the end of the last sync.