Lightroom Workflow with 2 portable external drives and old Macbook Pro?

i considering purchasing 2 2tb usb 3.0 wd portable external drives use lightroom.  i'd save original photos on external drive one, , save backups of these photos on external drive two.    have older macbook pro laptop (early 2011) , understand though drives have usb 3.0, laptop still use them 2.0 due age , slower, still ok in general.  slow use lightroom laptop access photos on external drive #1 editing?  speed considerations, salesman external drives suggested first save photos laptop, edit them there using lightroom, , afterwards save original photos external drive 1 (as master) , external drive 2 (as backup).  suggested delete photos laptop keep storage there low.  seems defeat purpose of lightroom, , i'd not sure if linkages edits remain intact.  (i brand new lightroom).  salesman did not lightroom user.   please advise on appropriate workflow edit, save, , backup efficiently older macbook pro laptop.

i have worked images on external hard drive in past, , have never experienced performance issues doing so. might want keep catalog on external hard drive well. way, hard drive can moved 1 computer if necessary.

 

moving images laptop hard drive external drive not lose adjustments have made because of adjustments stored in catalog. if of removing within lightroom program keep track of images located , adjustments remain intact. unless experience sort of performance hit working images on external drive don't think there advantage editing , moving them off external.

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