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How to remount ubuntu root (/) drive in read-only mode. please explain

i want to tack my ubuntu 10.10 backup in a NTFS drive(where i creat a folder named "Backup", so i use this command "fsarchiver savefs /dev/sda7/Backup/gentoo-rootfs.fsa /dev/sda10" its display this error [errno=20, Not a directory]: archwriter.c#116,archwriter_create(): cannot create archive /dev/sd...