Seconded for BackupPC. I've been using it since I first saw a release announcement for it on Slashdot ~15 years ago. I combined it with automated weekly archiva

Seconded for BackupPC. I've been using it since I first saw a release announcement for it on Slashdot ~15 years ago. I combined it with automated weekly archival uploads to an off-site server (that I was also using for other purposes), as well as a manual monthly transfer I would make to an external hard drive (that would otherwise remain powered off, in case someone/something managed to get access to all of my live machines).