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Linux is very friendly to simple file-based restores. I've done this many times. My own workstation has been transplanted through many storage setups and hardware over 14 years without reinstalling.
If anything goes wrong, as long as your filesystem got copied over properly, you can always boot off a live iso (I recommend systemrescuecd), mount the partitions, chroot and fix it.
Now if you do this with *Windows*... That's a whole different story. I've done it once. It wasn't fun. Possible, but not fun.
Consider: Gentoo is *shipped* as a tarball you untar and that's your root filesystem. Literally the install process is just fdisk;mkfs;mount;tar xpf;chroot, then configure a kernel and bootloader (and other misc settings). No different than a backup!
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