How to set the total size, and band size, for your sparse bundles, with calculation of the critical band size.
Spundle
Spundle 1.1 adds creation of encrypted sparse bundles, changing their band size, and more.
Time Machine can’t make backups to a disk formatted in APFS. Oh yes it can – and here’s how you can do it too.
Saves you from having to learn how to use hdiutil, and supports 6 different file systems and custom band sizes.
The Eclectic Light Company 