Thanks for the info guys. I have setup differential backup using windows 7's native backup service. that does pretty much what I want.
I dont know how much of a chance of corruption is there for the metadata file but I think it is reasonable that calibre should create 3 or more backups at selected intervals. Like one month, one week and at startup. Most applications that access a file so frequently create backup files.
Even if a new users has just started using calibre and added only 50 books and then looses the metadata file for some reason then he or she would be distraught. especially since new users are not aware of the nuances of an application or may not be a techie who can setup backups etc.
what do you think?
@kovid thanks. didnt think of backing up settings
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