Storage or backup?
If all you want is storage then a big external drive and windows backup will do it, drag/drop also available.
Next step up is a network drive – no need for plugging it in every time as it’s there when you are on your network.
Separate tech is cloud storage – Dropbox/google drive etc. none of the free ones will allow you enough space for a decent pic collection I pay some extra to Google for a lot of photo storage via picassa. The folder is automatically synced when it runs. Same can be done with Dropbox.
To have a backup then the 2nd copy needs to be in a different physical location to the original.
My personal preference would be Network storage so that stuff is accessible to everyone in the house (music/vids/pics) with cloud storage for backup.