Is network monitoring useful if everything we use is in the cloud?
Less than for a company with a local network, and sometimes not at all: if your staff work on laptops from anywhere and use only cloud services, there is little office traffic to watch. In that case, put the money into endpoint protection on each laptop, multi-factor authentication, the sign-in and audit logs of your cloud services, and backups of cloud data. Network monitoring becomes useful again as soon as an office has shared devices: printers, a NAS, phones, cameras, a building system or a server in a cupboard. It also helps if some laptops must be watched directly: the NetSenX agent runs on Linux and macOS and sees that machine's own connections wherever it is.