Synchronize Pro X is an “industrial-strength” backup and file-sync app for older Macs from Qdea. Features include the ability to handle very large numbers of files with fast transfer, detailed control over sync operations, conflict resolution and manual overrides plus sync previews, automatic sync of watched folders, archiving of files, configurable error handling and warnings, incremental backup, scheduling, bootable backups, logging, AppleScript and more.
Synchronize Pro X 6.9 is a 32-bit application for Mac OS X 10.6 through macOS 10.14 but does not make bootable backups of macOS 10.13 or 10.14 systems, and no version is planned for macOS 10.15 or later. Licenses are available via email or phone contact. Synchronize X Plus is a lower-priced version with fewer features. A one-week demo is available.