the only sensible place to store the DRMd versions woudd be on the Kindle device,a s that is the only place you can read them. [ unless u install kindle for PC/Mac and register that to same account, then you can store copies in a PC folder also ]
if you lose or break your reader, than any backup download copies will be useless anyway unless you break DRM. You'd be more likely to get a new amazon device then download new copies from your amazon cloud to that new device, which they will then be keyed to.
if you ever become one of those small number of unfortunates that Amazon decide to ban ( rightly or wrongly) - & there are horror tales of folks getting permanently banned by amazon, then you lose everything you've paid for unless you have "freed" copies.
It really does seem simpler to install the calibre plug in!
PS - & if you think that bans can't happen , a little googliing will put you right. With both ebay and amazon , if you get on their "wrong side" there's no appeal, no way back.
e.g. I once ( many years ago ) complained to ebay that I was seeing doggy emails relating to an ebay account that was not mine ( but the email address was mine). That email address is now blacklisted for ever at ebay. I have argued as much as I dare but they will not un-ban it so I can't ever link it to my real ebay account. On their system , that email address shows as linked to an account with suspect activity. I even found a way into that account via retrieve password & tried to shut it down, in order to free up my email address but no joy. OK that's a mild case, I can still use ebay but it shows how there can be no appeal - & I dare not complain further for fear of losing my entire ebay account.
If amazon one day decide there's piracy, or excessive returns associated with an account, or even there is some other fact that they can refuse to disclose, they can zap you & then it's bye bye books. They, and ebay both, do smart tricks with cookies, IP addresses, postal addresses... so if you ever do get zapped it can be very hard to ever open a new account.
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