[Unit]
Description=Backup ~/.thunderbird/<profile> directory
ConditionFileIsExecutable=/usr/lib/systemd/scripts/backup-thunderbird
ConditionKernelCommandLine=!systemd.setenv=REALTIME=true

[Service]
EnvironmentFile=-/home/%u/.crypted-backups
EnvironmentFile=-/home/%u/.config/crypted-backups
Nice=19
IOSchedulingClass=2
IOSchedulingPriority=7
ExecStart=/usr/lib/systemd/scripts/backup-thunderbird