SharePoint 2010: SharePoint Administrators Task list - TechNet Articles - United States (English) - TechNet Wiki

Daily

Using a browser, connect to the top level sites of all instances of SharePoint within your environment, to ensure they are reachable.
Log on to all applicable SharePoint servers (Web Front End, Application, Database) to ensure they are running properly. This includes any Development or Staging environments as well. Althou/div>

Weekly

• Monitor SharePoint Disk space usage through the built in SharePoint reports for each site collection. Depending on space usage and the speed at which the numbers change, use this activity as a chance to clean up duplicate or old data, working with the Site Owner or the individual document owner to free up additional space.
Hold a Site Owner meeting either weekly or bi-weekly just to make sure all owners are aware of changes to the environment forecasted, or to get their feedback on how to make the SharePoint environment more user friendly.
Check the backup jobs (can be done daily as well depending on criticality of your environment), make sure the backup files themselves are consistent in size and check the jobs for proper completion.
Check for Microsoft Patches/Knowledge Base articles for SharePoint/MOSS (RSS Feed for MOSS KB Articles – http://support.microsoft.com/common/rss.aspx?rssid=11373&ln=en-us&msid=d65614f79e70034a979b7832fc125f25)
Archive Event logs, if necessary.

Monthly - Check for Operating System and SQL Patches. Work with your hardware/virtualization group to ensure that BIOS and Service Packs are applied properly to the Hardware that is running your environment.
Monthly – Validate backups. Restore a backup to a test environment to ensure that everything is getting backed up.
Monthly – Update Documentation. Check the validity and accuracy of any documentation that is used by the end users, site owners and Administrators.
Quarterly- Check long term storage needs based on weekly numbers.