IMO set up a good incremental backup system with deduplication and then back up everything at least once a day as a baseline. Anything that's especially valuable can be backed up more frequently, but the price/effort of backing up at least once a day should become trivial if everything is set up correctly.

If you feel like hourly snapshots would be worth it, but too resource-intensive, then maybe replacing them with local snapshots of the file system (which are basically free, if your OS/filesystem supports them) might be reasonable. Those obviously don't protect against hardware failure, but help against accidental deletion.