Context: I make backups / archives, primarily of photos. I'm experimenting with Bup, which is designed for backup to hard disk. Basically it creates Git repos which include packfiles of up to 1GB. But I still need last-ditch backups to keep offline and move offsite (and keeping them on read-only media is good too!).
What are the options for archiving and splitting large files over several discs like CDs (and reading them back!)? I'd prefer methods which
- will stay readable in future.
- are portable e.g. to Windows.
- have known simple implementations, so I could re-implement them myself if necessary.
(Using Bup packs will stretch my robustness budget. So I want to be confident about how other parts of the system would behave).
I heard split archives are possible with both ZIP and 7-Zip. Is that right?