rclone backend should honor advanced options (see #3142)
rclone backend should honor advanced options (see #3142)

mnaiman/duplicati,sitofabi/duplicati,mnaiman/duplicati,mnaiman/duplicati,sitofabi/duplicati,duplicati/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,sitofabi/duplicati,sitofabi/duplicati,duplicati/duplicati,duplicati/duplicati,sitofabi/duplicati,mnaiman/duplicati