Re: Already mitigated
Weirdly, I have about 3 separate backup approaches to my iPhone which all worked from quite a while back. The whole iCloud thing which I'm not using (no point in paying for a few GB extra while I have about 1TB on SSD myself in an online server), the Finder in MacOS has backup and sync abilities, and there is even a third party bit of Swiss software from DigitalDNA called iMazing (OK, its name is not impressive), which does a lot more with backups than just, well backing up, such as scanning for spyware, a more interesting way to work with profiles and the ability to export the call list which is so complete it also shows calls via Telegram, Signal et al. I also heard from a friend of mine who wants my old iPhone that it is apparently possible to work with it from Linux (he wants to ditch Android because Google isn't exactly focused on protecting privacy).
I cannot imagine that Android with its far more open structure does not have similar options, and even if it doesn't it's relatively easy to jailbreak and install software that does - which, by the way, does not need to be loaded from Google.
As for identical phones, let's just say I don't care much about that. I have a phone to act as, well phone (surprise! They still do that!), and to act as a platform to run the apps I need which are again phone (secure voice/video via Telegram and SIgnal and some WebRTC gadgets), messaging, GPS and email. I don't use the web browser at all as I have other things with bigger screens. I buy a new phone every two years or so simply to keep up with current tech and reliability, and my "old" yet still fully functional phones tend to be passed on to others so they don't become landfill. I'm OK with them being identical, the whole Microsoft idea of changing UI and UX so that they could sell basically the same software again as "new" has never appealed to me (weirdly, that has not abated now they have people on subscription).