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资源说明：Haskell program for managing tarsnap backups
# tarsnap-backup [](https://travis-ci.org/irv/tarsnap-backup) This application manages tarsnap backups, and is expected to be run via cron, although doesn't have to be. In its default mode, it should take 6 daily backups in a row until Sunday, at which point it should take a weekly backup and remove those daily backups. It will carry that on until the first day of the month, when it will take a monthly backup, clearing up any weekly backups. You can force a backup of a specific type and/or disable the clean up. The archives will be created in the following format: `Basename-Frequency-YYYY-MM-DD` So, if i was backing up my Mail directory daily: `Mail-Daily-2010-09-18` Or the file world_domination.txt weekly: `world_domination-Weekly-2010-09-19` ## Requirements - tarsnap - a tarsnap.rc (system or user level for the user executing it) - GHC 8 ## Installation Now uses stack, but you can still use cabal ## Error Codes The Error Code should be passed through from tarsnap, along with any error text. Handy tip: code 127 means the tarsnap executable can't be found in the $PATH. On Unix systems by default tarsnap will be in /usr/local/bin unless you ran configure with the --prefix option. /usr/local/bin *is* in the path for cron at system level (on my Debian system), but when running my user's crontab, it doesn't appear to be. My suggestion is to install tarsnap into /usr not /usr/local. ## Cron Examples Note: these examples pipe the output to logger so errors show up in syslog or however you have your system configured (I don't run a local MTA on my desktop machine, for example, so cron can't email about failures) To automatically back things up, at 4AM every day: `0 04 * * * /usr/bin/tarsnap-backup /home/irv/Mail 2>&1 |/usr/bin/logger -t tarsnap-backup` This will backup my Mail directory every day at 4AM, producing 6 daily backups, then on a Sunday a weekly backup and remove the daily ones. Then on the 1st of the month, a monthly backup, deleting all the weekly backups. If you just want to force a type of backup? `* * * * 0 /usr/bin/tarsnap-backup -f=Weekly /home/irv/Documents 2>&1 |/usr/bin/logger -t tarsnap-backup` Once a week, backup my documents folder. You might want to disable clean up if you only ever run a weekly (or monthly) backup; this will save you a tiny amount of time and bandwidth. If you don't want to lose the granularity of the daily backup (and have it merge into a weekly then monthly), you can force the frequency to daily. Another handy tip: make sure you have a blank line at the end of your crontab or it won't run!
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