saving uncommitted changes in /etc prior to emerge run

fstab.bak

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+# /etc/fstab: static file system information.
+#
+# noatime turns off atimes for increased performance (atimes normally aren't 
+# needed); notail increases performance of ReiserFS (at the expense of storage 
+# efficiency).  It's safe to drop the noatime options if you want and to 
+# switch between notail / tail freely.
+#
+# The root filesystem should have a pass number of either 0 or 1.
+# All other filesystems should have a pass number of 0 or greater than 1.
+#
+# See the manpage fstab(5) for more information.
+#
+
+# <fs>			<mountpoint>	<type>		<opts>		<dump/pass>
+
+# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
+/dev/sdb1		/boot		ext2		defaults,noauto,noatime,nodiratime	1 2
+#/dev/sda8		/		btrfs		noatime		0 1
+/dev/sdb2		/		ext3		defaults,noatime,nodiratime 0 1
+/dev/sdb3		/home           ext3		defaults,noatime,nodiratime 0 2
+#/home/swapfile		none		swap		sw		0 0
+
+/dev/sda1		/media/Elements  ntfs-3g	users,exec,locale=de_DE.utf8,uid=1001,gid=100,umask=000   0 0
+#/dev/sda6               /media/Windows   ntfs-3g	users,exec,locale=de_DE.utf8,uid=1001,gid=100,umask=000   0 0
+#/dev/sda1               /media/Programme ntfs-3g	users,exec,locale=de_DE.utf8,uid=1001,gid=100,umask=000   0 0
+#/dev/sda5               /media/Games     ntfs-3g	users,exec,locale=de_DE.utf8,uid=1001,gid=100,umask=000   0 0
+
+/dev/sr0		/media/cdrom	auto		noauto,ro,noexec,users	0 0
+/dev/fd0		/mnt/floppy	auto		noauto		0 0
+
+proc		        /proc           proc	        defaults             0 0
+shm     		/dev/shm        tmpfs   	nodev,nosuid,noexec  0 0