Brave’s implementation of Sync is … suboptimal. It fails to recognize a “source” and a “target”. Instead, it appears to transfer bookmarks between Brave/Sync-enabled installations ignoring whether the new instance of a bookmark duplicates existing entries. Further, I’ve found it fails to retain how and where a bookmark is stored in one instance when transferring it to another instance. In other posts, I’ve compared Brave’s implementation of Sync to the Sorcerer’s Apprentice’s broom going out for another bucket of water: no control over it, and once it starts, you need a Sorcerer to stop it. Also also, it only applies to bookmarks, not to e.g. extension preferences.
Suggestion: use a 3rd party alternative. https://freefilesync.org/download.php gets favorable mention from other users.
With Windows-7 installations, I use Microsoft’s free SyncToy 2.1 application: https://www.microsoft.com/en-us/download/details.aspx?id=15155
SyncToy brings with it two consequences either of which might be deal-breakers for others: first, some (but not all) Brave preferences are restored to their defaults; and second, extensions must be re-installed. If these consequences aren’t deal-breakers for you, bravely onward.
Search your computer for an entry similar to:
where C:\ is the drive where Brave is installed and ***** is your user name. If you inspect the properties of this entry, it should have hundreds of sub-directories (folders) and thousands of files. I transfer this entry to the equivalent location on the target computer using SyncToy 2.1’s “Echo” action. SyncToy’s “Echo” action transfers entries from source to target that don’t currently exist on the target; updates older existing entries on the target; and deletes entries on the target that aren’t on the source. Further — and this is really important — SyncToy retains the style/format/appearance/location of the “source” bookmarks on the target. And, as already alluded to, SyncToy also transfers customized extension preferences.
I do this with the computers physically networked through a common router, but that’s not required. All that’s required is that the computers be available on the same network. Physically networked, the operation takes about a minute.