Make OnlyOffice backup opened documents

More information about when OnlyOffice saves documents to NextCloud is in this issue: https://0xacab.org/infrared/platform_wg/docker-onlyoffice-documentserver/issues/2

Just came back from lunch after having my onlyoffice open but not in use for an hour. Checked my local copy of the file I had open in OnlyOffice, and it was still empty.

This means that I now know for sure that OnlyOffice does not save to NextCloud while it still has an open connection to someone. I think it wouldn't hurt if it saved every five minutes or so, just to make sure that if anything happens, document data is not lost.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information