[MacOS] $0 SyncTime (Was $2.99) @ Mac App Store

Looks like good app… and its free now so enjoy.

Description

SyncTime is the simplest solution to synchronize your files. Did you ever wish you could easily keep up to date all your backup copies, distributed across many devices?
SyncTime will just do it.
SyncTime is capable of so many things, yet is so simple to use. From manual, scheduled or completely automatic syncing, to background syncing, bidirectional syncs and sophisticated exclude filters, you'll be able to set up your syncs exactly as you imagine.

You can create as many sync items as you need and customize each one individually. A sync item mainly consists of two folders: a source and a destination. You can choose any two folders reachable in the Finder: they can be located on your Mac, on an external drive, like a USB stick, or even on a remote server. Among the possible options you will find:
• background syncing: changes are monitored in real time in order to keep your destination always up to date
• three overwrite policies: don't touch files already existing on the destination, overwrite only if the source file has changed or overwrite always
• three sync types: one-way sync (default), two-way sync (merge source and destination) and one-way move (delete the source files after a successful transfer to the destination). Please read carefully about these sync types in the Help section on the SyncTime website
• remove files that don’t exist on the source anymore
• start to sync automatically whenever source and destination become available or sync once a day, a week or a month
• every sync item can be dependent on other sync items: it will trigger the dependencies and run automatically when they are all completed
• files to be overwritten or removed can be moved to the trash (requires Mac OS 10.8 or newer)
• exclude hidden files, files with names containing specific words or matching a regular expression, and selected files. Or exclude the root directory and specify just some included files.

Other features include:

• changes have to be confirmed by default and you can inspect the files that will be added, overwritten and removed and preview them in QuickLook
• cancel a running sync at any time and restart it later
• syncs run in parallel
• automatic launch on login can be enabled from the status bar menu
• your Mac can automatically be set to sleep or shut down after all syncs have finished (requires macOS 10.8 or newer and the respective Applescripts to be installed in the Scripts directory. For detailed instructions, please visit the website)
• export your sync items and reimport them at any time, on any Mac.

What users say about SyncTime:

Great App! Simple setup, fast sync, no-nonsense! Works very good!
— Jurweer

It does what it promises, and it does it well.
— iRecycler

I have been trying to sync folders on various systems from the bad old MSDOS days on, and have been afflicted with a succession of tedious geeky cranky programs in both the Windows and Apple world. My last one could do almost anything, if you had a week to figure out how. Suddenly, the problem is solved! SyncTime is simple, elegant, intuitive and actually fun to set up and use. I thank whoever did this. One of life’s aggrevations has been resolved. Seriously, this is an Apple-worthy point and click program that presents a lot of flexibility in an uncluttered, elegant way. Someone put a lot of work into making this clean and simple for us. Thanks.
— Graymauser

Extremely well designed and does what it says - FAST! I use it to sync important folders to a USB flash drive as an offsite backup to supplement my regular time machine backups. I wanted to be able to manually control what I sync based on what I know I've changed, but still have a level of automation that makes it fast and easy to use. SyncTime delivers on all counts! Great app!
— dan•tha•man