Sync using file list

[asterysk]

I would like to use Freefilesync to copy new and changed files to a third drive.

Drive 1 is in Australia on a Synology NAS but accessible via a windows PC

Drive 2 is in UK on a Freenas but accessible via a Mac Mini

Drive 3 will be floating and used to transfer new and changed files between Drive 1 and Drive 2

Neither Drive 1 or Drive 2 has (or will have) internet access (apart from email)

I was hoping to use Freefilesync to create a file list of a Drive 1, this file list would then be emailed to the UK computer and Freefilesync would then compare the UK Drive 2 against the file list and copy any files that are newer (i.e. newer on Drive 2) to Drive 3.

Drive 3 would then be physically transported to Australia (along with Drive 2 file list) and FreeFileSync would copy the files on Drive 3 to Drive 1

The whole process is then repeated in reverse.

Is this possible (the FreeFileSync bit, physically moving drive 3 between Australia and Uk is already taken care of)

Many Thx

[Zenju]

FreeFileSync will need both left and right directories to be accessible during comparison. Apart from that, saving diffs is possible via versioning or CTRL+T.