The 'Bi-Directional' sync operation in ChronoSync functions like the 'Backup' sync operation above, only it copies items to both targets. The system ‘cloning’ you’re referring to is the Bootable sync operation, and it’s offered as both a ‘Bootable Backup’ sync operation and a ‘Bootable Mirror’ sync operation for different needs and purposes. This is done to make the destination a 'Mirror' copy of the source. In a mirror sync operation, items are deleted immediately, and not only this, but anything in that destination target folder that isn't in the source folder will be deleted, even if it was never synced by ChronoSync in the first place. Also, only deletions made after the initial sync run with 'Sync Deletions' enabled will be deleted from the destination.
This allows ChronoSync to collect a history of the items on both targets so it knows what to delete. There are two main types of sync operations in ChronoSync, a ‘Backup’ and a ‘Mirror’.Ī Backup sync operation will only copy items from source to destination if the destination contains an older copy than the source.Ī Mirror sync operation will copy items from source to destination if the destination contains a different (can be older, newer, whatever) copy than the source.Īlso, when 'Sync Deletions' is enabled in a backup sync operation, deletions are not synced during the first run of the sync document. I found this out myself after spending hours doing backups where there were no new files or other changes. Renaming/moving large folders on the destination drive to reflect any changes on the source drive is a good idea. So I should probably do a "Mirror" once in a while then, to clean things up and ensure I have an identical backup. Yes, I've been renaming and moving things around as far as I remember for those files that don't get deleted on the destination drive. So Mirror is sort of like cloning the drive, except cloning duplicates the whole drive I assume (not just the files, but the invisible stuff as well) whereas "Mirror" only duplicates the exact same files/folders (leaving the underlying system specific stuff alone)? I wasn't aware of the "Mirror" sync operation all I've been using is "Backup left to right" and "bootable left to right". I've been reusing the same sync document each time, but I may have created a brand new one when things didn't work as I expected. Only file and folder attributes will be synchronized. If you do this, then the data won't be transferred.
If you need to rename or move large files or folders, you can avoid the data transfer by performing the same file/folder rename/move operation on the destination target before syncing. It sees this as a file/folder being deleted in one location and a new file/folder appearing in a new location in the sync tree.
If you choose to run this, be very careful as it will delete anything on the destination that is not on the source to make the destination a mirror copy of the source.Īlso, ChronoSync doesn't recognize a 'Move' or 'Rename' operation. If you'd like deletions synced immediately with new sync documents, consider using the 'Mirror' sync operation with 'Sync Deletions' enabled. Can you tell me if you're reusing the same sync document or creating a new one each time you run the backup? You need to be reusing the same sync document for ChronoSync to handle deletions properly.
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