I use the Goodsync file synchronisation tool to do incremental backups of all my data, including critical configuration data. To local external drives daily, and weekly to a commercial FTP service.
I prefer this approach to any proprietary backup format because: a) I can restore individual items using familiar tools (file manager or data type specific tools such as calibre and iMatch) and b) I can access the backup copies with data type specific tools such as calibre and iMatch.
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