There seems to be no way to include symlinks within a folder.
I considered to collect all links in folder backup_links.
disk f: $RECYCLE.BIN/ .duplicacy/ main_folder/ backup_links/ symlink1 symlink2 symlink3 ... folder_to_skip/ ...
+main_folder/* +backup_links +backup_links/ +backup_links/* +backup_links/symlink1 +backup_links/symlink1* +backup_links/symlink1/ +backup_links/symlink1/* +backup_links/symlink2 +backup_links/symlink2* +backup_links/symlink2/ +backup_links/symlink2/* -*
Listing backup_links/ backup_links/symlink1 is included by pattern +backup_links/* backup_links/symlink2 is included by pattern +backup_links/*
and that’s all. No listings of symlinks. Content of main_folder is included.
OS: Windows, duplicacy_win_x64_2.2.3