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OK, sounds good. Just a couple of more comments:
1. When I stated "Also, when you upgrade to the new Mac OS, you'll need to delete the eDrive again, and create a new one, which will be based on the newer Mac OS you plan to upgrade to", that is not valid. I did "kind of" correct it later on in my post above, as when you "migrate"/copy needed "stuff" from your backup after the completion of Yosemite's installation, the eDrive is not "migrated"/copied, so you will need to create a new eDrive (all the other "pieces" of TechTool Pro will be copied over).
2. There is a product very similar to SuperDuper! entitled Carbon Copy Cloner. It is also an excellent choice, but there are two differences from SuperDuper!:
A. As already mentioned, SuperDuper! costs $27.95 (demo mode available), whereas Carbon Copy Cloner costs $39.95 (demo mode also available: https://bombich.com/kb/ccc4/how-does-free-30-day-trial-work).
B. Carbon Copy Cloner also backs up the (hidden) Recovery HD partition, whereas SuperDuper! does not. For myself, that is not an issue, as 1) that partition gets recreated on a clean, fresh installation of the Mac OS, 2) there are other ways of re-creating it, 3) I (and you also) have a more advanced disk cleanup/maintenance/repair program in TechTool Pro, and 4) with a SuperDuper! bootable backup, I can restart my Mac from such a backup, and use whatever tools I have there, including Disk Utility.
1. When I stated "Also, when you upgrade to the new Mac OS, you'll need to delete the eDrive again, and create a new one, which will be based on the newer Mac OS you plan to upgrade to", that is not valid. I did "kind of" correct it later on in my post above, as when you "migrate"/copy needed "stuff" from your backup after the completion of Yosemite's installation, the eDrive is not "migrated"/copied, so you will need to create a new eDrive (all the other "pieces" of TechTool Pro will be copied over).
2. There is a product very similar to SuperDuper! entitled Carbon Copy Cloner. It is also an excellent choice, but there are two differences from SuperDuper!:
A. As already mentioned, SuperDuper! costs $27.95 (demo mode available), whereas Carbon Copy Cloner costs $39.95 (demo mode also available: https://bombich.com/kb/ccc4/how-does-free-30-day-trial-work).
B. Carbon Copy Cloner also backs up the (hidden) Recovery HD partition, whereas SuperDuper! does not. For myself, that is not an issue, as 1) that partition gets recreated on a clean, fresh installation of the Mac OS, 2) there are other ways of re-creating it, 3) I (and you also) have a more advanced disk cleanup/maintenance/repair program in TechTool Pro, and 4) with a SuperDuper! bootable backup, I can restart my Mac from such a backup, and use whatever tools I have there, including Disk Utility.