Onlyoffice with NextCloud Hub and empty documents

[ARGUCS]

Hello,

i installed some days ago NextCloud HUB on Debian10 to use integrated Onlyoffice.

Evering works fine. No problems during installation. I was able to start Onlyoffice. I did create some Documents (*xlsx). I was also able to open the Documents on other PCs.
At least i did create a Rsync-Backup from the Data Folder ( /var/www/nextcloud/data) to have my created documentes save.
BUT - if im trying to open the backuped Document (*xlsx) the document are empty. MS Excel is opening and showing a table witout any entries.
I tried to open the same files with Onlyoffice desktop edition - the same again. no entries in documents. But on the NextCloud/Onlycloud Server i can see all entries!

What is wrong here? Any Idea?

Thanks for the answers in adavence.

[anon71540698]

You are not alone with similar problems

Data Loss Nextcloud <-> OnlyOffice

There are many open Issues regarding the problem that Changes in Documents are shown in the OnlyOffice App (Cache) but are not written to the Documents in Nextcloud. The oldest one is https://github.com/nextcloud/documentserver_community/issues/12 The last activity was 1 Month before. Issues are not answered. NC Core Team should fix this immediately and release an updated App of that Document Server.

[ARGUCS]

thanks for briefing me.