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@kaufman & @Purple Lady: The marshmallow automatic backup attempts to backup everything in the "private" area. For CC this is settings and the database. The books are not automatically included.
The major problem I have, other than that I have failed to make it work at all after hours of attempts, is the limit in size. The maximum it can handle is 25 MB. On my test system the DB is 3.5 MB for 80 books. If this scales (and it should) then the auto-backup will start failing at around 500 books. For me, it is unacceptable to "promise" that something is being backed up when it easily might not be.
CC's backup works. You can store the backup in a folder that is synced to the cloud or copy the backup to an SD card. I know that this doesn't deal with the user who "forgot to make a backup" and the problem of a device that dies, but then neither does the auto-backup if the library is of any reasonable size.
If I could ever make it work at all then I could experiment with automatically making a CC backup and storing that in the android backup area. CC's backups are compressed and much smaller than the raw data. Unfortunately, given that it won't work on my only Marshmallow device there isn't much hope of going there.
BTW: I have found that is is very convenient to use "connect/sync book" to repopulate the books folder after a wipe. When I restore CC's DB all the books are "missing". I then run sync books (sometimes it takes 2 times) and CC fetches all the books from calibre without further intervention.
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