Time Machine from 2 Macs on 2 Drives

First post, hope I can make sense.
With Time Machine, it seems there are many different and unique situations for various users, and it seems there are options for everyone, but with all the searching I've done so far, and that's a lot, I can't seem to find the answer to my particular question/situation. I'll try keep it simple. Wife and I been sharing a Macbook Pro 13" for 2 years, 1 TM backup between 2 external disks, simple. But we can't share the same comp any more, so we got another of the same. What I want to do now is back up both computers to the same 2 drives, her computer now has all our photo's 57 000 of them, and my comp has our music, 16 000 tunes, and about 400gig home video, on another external drive for just that purpose(iMovie)
We travel a lot, so one of those drives is a 3T Seagate which stays at home, then we take a 2T WD with us, now add another computer to the mix and this is where I'm stumped. It's taken us the better part of 4 years to collect all this stuff, so I don't particularly want to mess it up.
I have just wiped the Seagate 3T, decided what it had was not needed anymore. I then proceeded to plug in my wifes new computer (to the Seagate) which now holds the photo's, and the 1st ever backup of her new computer was done successfully. I am now busy moving the WD backup to the Seagate, but when I did this, it asked if I wanted to replace the existing Backups.backupdb, or keep both.....I kept both. Now I have a Backups.backupdb, and a Backups.backupdb (Original) in the root of the Seagate.......is this a problem? should both laptops be inside one Backups.backupdb file, and then 2 separate computers can be seen?

Went through all backups and decided there was nothing to keep, so I just wiped the lot and have started fresh, made things a whole easier. Kinda like my basement....can't keep everything, otherwise I'll need another house, although hard drives are cheaper than houses!

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