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| -rw-r--r-- | README.md | 10 |
1 files changed, 5 insertions, 5 deletions
@@ -39,11 +39,7 @@ On macOS, it has a few disadvantages compared to Time Machine - in particular it * To mimic Time Machine's behaviour, a cron script can be setup to backup at regular interval. For example, the following cron job checks if the drive "/mnt/backup" is currently connected and, if it is, starts the backup. It does this check every 1 hour. - 0 */1 * * * if [[ -d /mnt/backup ]]; then rsync_tmbackup.sh /home /mnt/backup; fi - -* The use of `flock` is recommended so that only one instance of the script runs at a given time: - - flock -n /tmp/rsync_tmbackup.lock rsync_tmbackup.sh /home /mnt/backup + 0 */1 * * * if [[ -d /mnt/backup ]]; then rsync_tmbackup.sh /home /mnt/backup; fi ## Backup expiration logic @@ -57,6 +53,10 @@ The script automatically deletes old backups using the following logic: An optional exclude file can be provided as a third parameter. It should be compatible with the `--exclude-from` parameter of rsync. See [this tutorial](https://sites.google.com/site/rsync2u/home/rsync-tutorial/the-exclude-from-option) for more information. +## Built-in lock + +The script is designed so that only one backup operation can be active for a given directory. If a new backup operation is started while another is still active (i.e. it has not finished yet), the new one will be automaticalled interrupted. Thanks to this the use of `flock` to run the script is not necessary. + ## Rsync options To display the rsync options that are used for backup, run `./rsync_tmbackup.sh --rsync-get-flags`. It is also possible to add or remove options using the `--rsync-set-flags` option. For example, to exclude backing up permissions and groups: |