Quote:
Originally Posted by JSWolf
You are best to have at least two backups because if you backup from an unknown corruption, you then screw up one backup. The other backup would then be needed to restore from.
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The ideal backup system for the best security is to back up to a new location each time, and never delete your old backups. Even with two backups, errors in the main database can propagate to the backups and ruin them if you don't catch them soon enough. If you have all your backups ever since you started backing up, you can just restore the most recent backup before the problem occurred.
Obviously, this isn't practical in the real world, because it requires more hard drive space than the average user is likely to have.
The closest reasonable solution is rotating backups. For example, depending upon the situation, you might have a different backup for each day of the week, or a different backup for each day of the month. A variation of this would be to have a different backup for each day of the month, but the backup on the first day of the month gets rotated into a set of monthly backups for each month of the year.
A scheme like this would still probably take up too much space just to make sure your Calibre database is backed up properly. My point is that you have to find a system that works for you. You have to weigh the importance of the data against the hard drive space the backups would require.