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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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cartridge-backup
Script to make incremental backups onto multiple, smaller drives from one larger source
A quick googling found this: https://github.com/zeycus/fsbackup
A customer I used to work with used http://www.amanda.org/ and used folders instead of tapes. I would think you could do the same on a system and automount disks. It was a PITA, but worked.
I had a problem similar to this and ended up writing my own python script to solve it since I also couldn't find anything that did what I wanted (incremental backups from one large drive onto multiple small ones, one backup disk connected at a time). Maybe it can be of some help to you too: https://github.com/Jeroen-45/cartridge-backup