However, unlike a traditional PBX, the service is hosted in the cloud. By setting up fail over actions for Auto Attendants, and groups you can make sure that calls will be delivered. You also have the options to setup Find-Me/Follow-Me or Call Forwarding for each user extension.
Responding to voicemails is time-consuming. Fortunately, with the right greeting, you might be able to save yourself some hassle. If you don’t have an auto attendant, you can give callers the information they are looking for with your voicemail greeting. Of course, this means that your greeting may be a little lengthy, but that can work in your favor as callers will only stay on the line to leave a message if they still need assistance.

19. Hi, you’ve reached [employee name]’s voicemail box. [Employee first name] no longer works for [company name]. Please call our main line at [phone number] and we’ll be happy to connect you with a current team member who can help.
There's no single best way to craft an after hours greeting. The most important point is that you equip your customers with what they need to know, and give them an avenue to contact you, whether that's through voicemail, email, or other channels.