Cloning a hard drive while being used in Production (no unmounting allowed)
Hello everyone, great resource you have here, I'm very glad it exists. Now let's cut to the chase. I have a webserver which is in production and I absolutely can not take offline, turn it off or unmount any drives or partitions. Now I need to make a clone of this drive as soon as possible, so that if anything happens I can just turn on my backup machine(same specs as the production server) and it will be as good as new and up and running again.
I've heard dd can do this but it requires the drive to be unmounted while the process is going in order to keep consistency.
Is there any other way of cloning my harddrive while it's in production?
I can plug in a USB drive if need be.
If not, is there a way of at least backing up most of the files in order to have a really fast way of bringing the system up if something were to happen?
Thanks a lot in advance and best regards!!