Syncing 2 Way with undesired empty folders

[Mstar]

If I have 2 directories "A" and "B" that I want to sync (where 1 is "B", an older archive of "A") and some of the folders in "A" have had some files accidently deleted or a folder is entirely empty which needs to be refilled from the archive "B", what is going to happen? Which takes precedence? My worry is that a folder was recently emptied of some files on "A'. so the app is going to think I want to duplicate this function in "B". What I am really wanting to do is sync "A" and "B" and if some of the files are missing, they will be replaced with the originals. In this scenario, I never wish to duplicate the deletion of files. I am new to the product but since there are 1000s of folders, there might be some that have empty folders on both sides but I never wish to delete files on either side. Hope this makes sense. The worst thing that could happen is I lose the files now IN BOTH "A" AND "B" thereby losing files forever after completing a two way sync.

Thanks!

[xCSxXenon]

Change from two-way to "update"
There is no "restore" function in FFS, you can just set up another config to do that, ex. a "mirror" from B to A

[Plerry]

It seems for @Mstar a Custom sync with the following settings (F8) is the way to go.
• Category: Item exists on left-side only ; Action: Copy new item to the right (Green arrow with plus sign)
• Category: Left item is newer ; Action: Update right item
• Category: Conflict ; Action: (choose whatever suits you)
• Category: Right item is newer ; Action: Update left item (normally this should never apply)
• Category: Item exists on right-side only ; Action: Copy new item to the left (Blue arrow with plus sign)
And make sure not to checkmark "Detect moved files"

Using the suggested Update variant would leave files on B that have been deleted from A;
using the above Custom variant will even "restore" (from B to A) files that have been deleted from from A.

[xCSxXenon]

Ah yes, quite an elegantly easy solution

[Mstar]

Nice! Thank you.