My current solution is to pay for a few TBs of cloud storage, which is enough for my backup needs. My server has a few scripts on it that I wrote which all run on different cron schedules. The scripts, in general, shut down the service it’s backing up, tars and compresses the files related to the service, spins the services back up, then copies the compressed archive to a central backup location, and a secondary backup on-site external hard drive. Another script runs every day which prunes old backups from the cloud storage, then uploads the new ones.