nilfs2 Simple Snapshot Scheduler
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The script +sss.sh+ is a "cron bot" script that manages nilfs2
snapshots to make a rollback history that contains:

 * the last of each year when older than a year, else
 * the last of each month when older than a month, else
 * the last of each week when older than a week, else
 * the last of each day when older than a day, else
 * the last of each hour when older than an hour, else
 * a new snapshot every hour