Tabbycat doesn’t provide an in-built database backup system; instead you should create copies of your database directly. Heroku provides a very good backup utility for all sites hosted on Heroku which makes this easy, and for Heroku-based Tabbycat sites, we strongly recommend it.
You should always back up the database before deleting any data while in the Edit Database area, because deleting data cannot be undone. It is also a good idea to back up the database before doing anything in the Edit Database area, unless you’re very familiar and confident with editing the Tabbycat database directly.
You may, as a matter of standard practice at large tournaments, wish to back up the database twice per round: Once just after you’ve generated the draw and allocated adjudicators, and once just after you’ve finished entering results.
If you’re using an online version of Tabbycat, it’s a good idea to download the backups. While it’s extremely rare to lose internet access or have an outage in a critical web service (i.e., Heroku), having a local copy of your backups allows you to restore your tab to a local installation if this ever happens.
Installations on Heroku¶
Heroku provides a utility to easily back up and restore the entire site database.
If you don’t have the Heroku CLI¶
You can capture backups from the Heroku Dashboard:
Go to the Heroku Dashboard and click on your app.
Under Installed add-ons, click on Heroku Postgres.
Near the top left of the screen, click on the Durability tab.
Click on Create Manual Backup.
Once the capture has finished, a Download button will be available.
You can’t restore a backup without the Heroku Command Line Interface (CLI), so if you end up needing your backup, you’ll need to install the Heroku CLI, and then follow the instructions below.
If you have the Heroku CLI¶
The best guide to backing up databases is the Heroku Dev Center’s PGBackups guide.
To capture a backup:
$ heroku pg:backups:capture
To download the most recently captured backup:
$ heroku pg:backups:download
To restore a backup:
$ heroku pg:backups:restore
If you have multiple Tabbycat sites, you’ll need to specify which one by adding
--app mytournamentname to the end of the command.
There are lots of ways to back up local PostgreSQL databases, but we’d suggest using the pg_dump and pg_restore commands.
Restoring a Heroku backup to a local installation¶
As detailed in the Heroku Dev Center, you can restore a downloaded Heroku backup to a local installation. This might be useful if, say, your internet connection breaks irrecoverably in the middle of a tournament and you need to run offline. Of course, for this to work, you need to have downloaded your backup before your internet connection broke—a good reason to download a copy of your backups as soon as you make them.
Assuming your download is called
latest.dump (this is the default name), your PostgreSQL username is
tabbycat, and you wish to call your local database
fromheroku (if not, replace arguments as appropriate):
$ createdb fromheroku -h localhost -U tabbycat $ pg_restore --no-acl --no-owner -h localhost -U tabbycat -d fromheroku latest.dump