xfsdump increment

hi,

I like to take incremental backup and then restore the data.

Code:xfsdump -l 0 -f /i/y /test

ls /test
test

cat test
test

then

i modify test
cat test
test
test1

i take incremental backup
xfsdump -l 1 -f /i/y1 /test

how i restore this test file from backup if /test/test is deleted before?

xfsrestore -f /i/y1 -s test /testis this correct?
i mean after full and incremental backup i like to restore this test file and to obtain
more test
test
test1