We use Nextcloud to sync Thunderbird AppData folder.
Thunderbird is configured with POP3.
In that folder there is a file called “Inbox.sbd” that grows up when new mails are received.
This file on some clients is bigger than 5/6 GB and anytime that a mail is received it’ll be updated, so nextcloud client will resync all the file.
There is a way to sync only the delta of the file and not all the file size again?