* If you use automated backup and recovery software you may have to reload and reconfigure your ownCloud data and backup system configuration before the next backup set is taken. Some backup systems allow you to change the ownCloud directory names (data, ownCloud config,php location) in the existing backup sets (rsnapshot).
* Starting with ownCloud 8.0, any-to-any major version upgrades will be supported. Prior to ownCloud 8.0, it was necessary to upgrade one release at a time (i.e. ownCloud 6 -> 7 -> 8) from the last prior software patch and security release. With ownCloud 8, it will be possible to upgrade from 8.0 to 8.3 or 9.1 directly.
* Starting with ownCloud 8.0, on upgrade, most applications are disabled, only certain "core" applications are left enabled (Files, Pictures). The ownCloud Community has "slimmed" down their installation package to provide basic functionality. Most "core" applications have now been moved to the ownCloud appStore.