I am guessing you want to access it from multiple devices???
If so, I have no experience, but if you can mount the cloud storage in a directory, then I would think you can point Calibre at that directory. Easy enough to try.
My own solution is to use Calibre Companion to create a walk around copy.
Yes, keeping oneās entire library on a tiny USB stick or external SSD is the ultimate security I suppose. Even I I donāt yet trust cloud storage to be truly āpermanentā.
And this how-to on making Calibre use a library in cloud storage seems straightforward:
The key is the access question. I.e., why do you want it in the cloud?
Iād like a master copy that can be accessed from anywhere and not have to worry about keeping a local copy. Itās just simpler that way. And it would probably be more secure and safer than keeping a local copy on a portable disk. Iād want at least two local copies for redundancy. But of course, the library could be kept both in the cloud and locally.
Would you have another copy of Calibre at those other locations? What kind of device is at those locations?
I have four devices that Iād want to be able to read from: Windows laptop, Apple iPad, Kindle Paperwhite, and Android smart phone. Cloud storage would probably be the most consistent and easiest way for all of them to be able to access a library.
Not 100% sure about the iPad, but the phone is exactly what Calibre Companion is made for. You bring the device near the computer, establish a wireless connection, it updates changes to previously downloaded data, you download any new books, disconnect and go your way. I would guess the same is true for the iPad. Not sure I know what you would do with the Kindle except to push updates to it with the match feature I referred to earlier.
Ok, thanks for the info. Iāll be exploring Calibreās capabilities more soon. Happy New Year!