I could be off-base, but I think keeping a lot of extra archives around leads to slower archive listing, fsck / cache directory resyncing and reconstruction, and restores?
Mac Time Machine backup defaults: 24 hourly, 30 daily, then as many weekly backups as space allows.
My config for tarsnap-cron: 7 daily backups, 5 weekly, 12 monthly.
It's my personal opinion, but a month is a nice buffer. Three days is shorter than some holiday weekends, not to mention vacations.
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My system has a daily cron job that does tarsnap backup which has been running since 2017, and "tarsnap --list-archives" shows a lot of archives. Should I care? Is it ok to just let the archive number keep growing? If there will never be a need to restore data that are more than 3 days old, can I just remove all archives that are more than 3 days old? Is it possible to configure tarsnap to only keep archives of the recent 3 days?