I dont like MS Backup at all, very few options and recovery is not user intuitive.
For non-commercial use, macrium reflect free is FAR better for full disk images.
Why are you backing up some data on HDD2 to HDD1, and some data on HDD1 to HDD2?
Should just 1 drive as backup and 1 drive for wathever oother storage you need.
SSD - full disk image once every 2-4 months, differential weekly (keep 2-3 fulls, and 2 months worth of differntials).
If laptop is left on, and on yoru network then you can use network shares to backup the drive instead of having to plug the drive into network.
For backups of just data files and not hard drives then I like syncback free program which gives you lots of backup options and scheduling.