bidirectional sync between multiple computers

[patrix87]

Sorry if this is a duplicated question, I looked at the search and could not find it.

I have a question regarding bidirectional sync between multiple computers through multiple drives.

Let me explain my situation.

I have 2 location. each have a computer in them.

I use 2 hard drives for backup that I exchange from one location to the other every week.

Computer A & Computer B
HDD 1 & HDD 2

On Friday I sync computer A on HDD 1 and leave for Location B

Every Day Computer B sync with HDD 2

On Monday morning I swap HDD 2 for HDD 1 and leave location B for Location A with HDD 2

On Monday night I put HDD 2 in Computer A and Sync Again.

Both location will modify the same folders and the modification should be reflected on both location.

Example: I delete a file from Folder X on Computer A and I add a file to Folder X on Computer B on the same day.

That night Computer B will sync the backup drive.

On the Friday Computer A will sync the backup drive

On Monday I swap the drives and on Monday night computer B and A will be sync and the file should be removed from both and the new file should be in both.

In more technical terms;

How does the bidirectional sync actually work.

Does it use a local database of file ? (which would not work since I have 2 computer)

Does it use a database of files on the backup drives (which could cause issues since I have 2 backup drive that I swap every week)

Does it use a database at all ?

Thanks for your help.

[Zenju]

Your scenario is well-supported. FFS database files are stored in each data location and it doesn't matter how many data sources participate in a FFS "two-way sync".