Upgrade to v 22.12

Our local Survey Solutions have version 21.01.5 (build 30686).
Can we upgrade to 22.12? Will it give any problem in upgradation?

Make sure you do a full backup before doing an upgrade. If anything goes wrong, you will be able to revert back to the previous stable state.

For full backup. What are things to do?
Please explain the full backup process.