launchctl
For daily user backups using launchctl timers, i.e. for the home@nas
preset, put the following in ~/Library/LaunchAgents/local.crestic.home@nas.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Daily crestic home@nas backup</key>
<string>local.crestic.home@nas</string>
<key>ProgramArguments</key>
<array>
<string>crestic</string>
<string>home@nas</string>
<string>backup</string>
</array>
<key>StartInterval</key>
<integer>86400</integer>
</dict>
</plist>
then activate the timer using
launchctl load ~/Library/LaunchAgents/local.crestic.home@nas.plist
For system backups, put this file in /Library/LaunchAgents
and the config in /etc/crestic/config.cfg