I've got files going back to 1991. They started on floppy and moved to various formats like hard drives, QIC-80 tape, PD optical media, CD-R, DVD-R, and now back to hard drives.
I don't depend on any media format working forever like tape. New LTO tape drives are so expensive and used drives only support small sized tapes so I stick with hard drives.
3-2-1 backup strategy, 3 copies, and 1 offsite.
Verify all the files by checksum twice a year.
You can over complicate it if you want but when you script things it just means a couple of commands once a week.
I don't depend on any media format working forever like tape. New LTO tape drives are so expensive and used drives only support small sized tapes so I stick with hard drives.
3-2-1 backup strategy, 3 copies, and 1 offsite.
Verify all the files by checksum twice a year.
You can over complicate it if you want but when you script things it just means a couple of commands once a week.