Use a 4 bay JBOD for working disk, backed up/synced/whatever you wanna call it, to a NAS in my house, which backs up/syncs/whatever you wanna call it, to an offsite NAS. All of my delivered files are also stored on SmugMug. Additionally, my entire library is backed up/synced/whatever you wanna call it, to the Adobe cloud.
When I travel I can access my entire library via the NAS or Lightroom CC.
It's automated, simple, and reliable.

