backup on Rock5B rsync: change_dir "//config" failed: No such file or directory (2)

[Dawerma]

When I try to use ”radxa-rbuild-backup.sh“ to backup my Ubuntu20.04 sytem on Rock5B, I get this wrong that can't continue
Wrong:

rsync: change_dir "//config" failed: No such file or director
rsync error: some files/attrs were not transferred (see previous errors) (code 23) 

So I use # to Comment for this code

184   # rsync --force -rltWDEgop --delete --stats --progress //config/ ${CONFIG_MOUNT}

It continue to backup but still get other wrong

rsync error: received SIGINT, SIGTERM, or SIGHUP (code 20) at rsync.c(644) [sender=3.1.3]
rsync error: received SIGINT, SIGTERM, or SIGHUP (code 20) at io.c(520) [generator=3.1.3]

I try again but not get this wrong and Backup done

So is it ok to do this way to continue backup,or it has some other better way to solve this wrong?