Originally Posted by GodsSilhouette
How exactly will that work? Let's say if I want to install a windows 7 back up image with linux mint already installed, will that affect anything such as the bootloader, etc.?
Depends on how you take the backup image..
When you say image, i am assuming here that you mean a block for block image, with dd or similar.
If you were to separately image each partition, you would be able to restore the image of the required partition at a later date, without affecting the other partitions (assuming you get the devices right, that is.)
This example wouldn't backup the MBR or partition table.
dd if=/dev/sda1 of=/mnt/somewhere/linux_mint_image.img
dd if=/dev/sda2 of=/mnt/somewhere/windows7.img
If you imaged the entire drive, then restoring would overwrite everything on the disk.
dd if=/dev/sda of=/mnt/somewhere/full_disk_image.img
The other option is to back up the filesystem with tar + xz (among other methods)