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Tobu was tested with 100k records with a database size of 1.36GB and
performed without a noticeable slowdown, but performance may vary
depending on the number of records matching a specific tag and the
number of unique tags shared among matching records.
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As with most freely available programs, there is no warranties, implied
or explicit, although every care is taken to test the program
thoroughly; please make sure that you backup the data file as a part of
your regular backup.
Data is stored in the sqlite format file called "data.db". You can back it up separately if you don't do complete system backups. There are many 3rd party tools that can read/view/modify sqlite format databases—your data will be safe and accessible as long as it's backed up regularly.