To trick OneDrive in backing up TimeMachine's backup, we use a SparseBundle filesystem (explorable) image/file, as it supports differential upload.
The partition of the SSD (that contains the backup as a file) is symlinked inside the OneDrive folder (using fstab
) so its content (the sparsebundle) gets synced AND is actually stored on the SSD partition (without taking space on the machine).
Create a TimeMachine.sparsebundle first, using Disk Utility:
- set filesystem to Journaled HFS+ - Mac OS Extended (Journaled) (NOT Case-Sensitive)
- choose "sparse bundle" as image-format
- use a GUID partition map
- give name "TimeMachineMac10" (is the mounting name, it will be used below from tmutil-setdestination!)