I’m using owncloud version 4.90.13 in my production environment. At that time, my boss asked me to stay update to date. So, I decided to upgrade my owncloud to latest stable version 10.2 . I explored some sites about upgrading without data lose but I didn’t found any relevant answers. Could you guys please help me to upgrade my old owncloud to fresh one?
it seems another user had asked a quite similar question on such an upgrade in a thread i’m linking above.
In your case i think the main problem would be to find such older releases before 7 to do the upgrade as well as knowledged people with such old versions if you’re facing any upgrade problems.
Maybe starting with a fresh installation of ownCloud 10.2 might be a better choice?