While I've of course backed up my Kobo and Kindle ebooks, I've never seen the point so far, of supplanting the original DRM versions on my devices. So I still just read those.
If my Kindle devices died, I'd have to use the Kindle backups on my Kobo device. But until that happens, the only other way, would be if I bought an independent E-Ink device, and wanted to read previous purchases on that. I seriously pondered doing that with one of the independent color devices, just before Kobo released theirs.
I could potentially use my backups on an independent reading app on my tablet. But thus far haven't seen the need to do that, or even desired to do so. The Kindle and Kobo apps are good enough.
While I have side-loaded ebooks from other sources onto my Kindles, I haven't bothered in recent times, just doing it with my Kobo device now instead.
I have in a couple of instances read a PDF file that displayed badly on my Kobo and Kindle apps, on an independent app on my 10" tablet. I tried a few until I found one that was suitable.
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