Hi , yes, doing local physical backup is the only way, and still , the recommendation is to have a copy stored in a remote location for important data, to protect from fire or even burglary.
For the two hours, I am surprised, it must be because you do a brute force copy/past each time you backup ?
You could use incremental tools that just update the stuff that evolved.

But it's good to restart from a new seed, maybe once a month, in case you do not realize you have a corruption in some part of your data and you start backing up it, loosing your reference doing so.