However, unfortunately, the Table of contents may also be broken, and there may be other unforeseen breakage primarily in the handbook portion of the wiki.
Presently the 10.1 Table Of Contents is being "reconstructed" becoming incrementally fixed while the other handbook versions may have various breakage.
- when you do an upgrade, programs installed via FreeBSD ports or packages will be removed. If you want to preserve these across system updates, you should install these within a ports jail using Warden®. Better yet, request that your favorite port/package is made into a PBI as PBIs are preserved during an upgrade.