You need to maintain constant moderation on these online resources and have some mechanism to assure continued moderation and maintenance should the usual moderator cease to be able to manage the site. This can be because the usual moderator ended up not being able to continue the job due to many different reasons including moving out of the building.
Having some form of committee buy-in may make sure that there is always someone who can keep the online resources alive and in good health. Even raising the issue at the AGM or in regular building communications can allow for the creation of a few volunteers to work the online resources. This includes setting up mechanisms to pass on the management of the online resources to other volunteers.