It's important that daily business isn't disrupted or compromised when a team member is absent. Audit your knowledge assets. Work with your team to define what each of you does, how you do it and whether it can be done better. Collaborate, record, optimise and implement the best practice.
Establish who undertakes each process and make procedural documents readily available. This often begs the question: is the right person doing the job? Perhaps the task could be delegated to someone with more relevant skills, who is more available to perform the task.
Document internal processes to:
Minimise risk by following a tried and tested formula
Provide consistency between team members
Document tricky processes for infrequent jobs
Reduce disruption due to staff absence or loss
Save time when inducting new team members
It's important to seek each other's opinions and suggestions to define the best processes and to empower the team by sharing information and responsibility.